{"id":106722,"date":"2026-09-18T07:48:40","date_gmt":"2026-09-17T23:48:40","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/106722.html"},"modified":"2026-09-18T07:48:40","modified_gmt":"2026-09-17T23:48:40","slug":"c%e8%af%ad%e8%a8%80%e6%8c%87%e9%92%88%e4%b8%8e%e5%8a%a8%e6%80%81%e5%86%85%e5%ad%98%ef%bc%9a%e4%bb%8e%e5%9c%b0%e5%9d%80%e3%80%81%e6%95%b0%e7%bb%84%e5%88%b0-malloc-realloc%ef%bc%8c%e4%b8%87%e5%ad%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/106722.html","title":{"rendered":"C\u8bed\u8a00\u6307\u9488\u4e0e\u52a8\u6001\u5185\u5b58\uff1a\u4ece\u5730\u5740\u3001\u6570\u7ec4\u5230 malloc\/realloc\uff0c\u4e07\u5b57\u8bb2\u900f"},"content":{"rendered":"<h2>\u4e07\u5b57\u8be6\u89e3&#xff1a;C \u6307\u9488\u4e0e\u52a8\u6001\u5185\u5b58\u5206\u914d<\/h2>\n<p>\u6307\u9488\u662f C \u8bed\u8a00\u4e2d\u7684\u91cd\u8981\u77e5\u8bc6\u70b9\u3002\u7406\u89e3\u6307\u9488&#xff0c;\u4e0d\u80fd\u53ea\u8bb0\u4f4f\u67d0\u79cd\u5199\u6cd5&#xff0c;\u8fd8\u9700\u8981\u5206\u6e05\u6307\u9488\u53d8\u91cf\u3001\u6307\u9488\u503c\u3001\u6240\u6307\u5bf9\u8c61&#xff0c;\u4ee5\u53ca\u5b83\u4eec\u5404\u81ea\u7684\u7c7b\u578b\u548c\u751f\u547d\u5468\u671f\u3002\u672c\u6587\u9488\u5bf9\u6307\u9488\u76f8\u5173\u5bb9\u6613\u6df7\u6dc6\u7684\u95ee\u9898&#xff0c;\u901a\u8fc7\u8bf4\u660e\u3001\u5bf9\u6bd4\u548c\u95ee\u7b54\u5f62\u5f0f\u8bb2\u89e3\u8fd9\u4e9b\u77e5\u8bc6\u3002 \u672c\u7bc7\u4e4b\u540e\u8fd8\u6709\u66f4\u591a\u5176\u4ed6\u5185\u5bb9&#xff1a;\u4e00\u6587\u8be6\u89e3&#xff1a;C\u7ed3\u6784\u4f53\u3001\u4e00\u6587\u8be6\u89e3&#xff1a;C\u679a\u4e3e\u3001\u4e00\u6587\u8be6\u89e3&#xff1a;C\u5171\u7528\u4f53<\/p>\n<h3>\u76ee\u5f55<\/h3>\n<ul>\n<li>\u4e00\u3001\u6307\u9488\u542b\u4e49\u4e0e\u7c7b\u578b<\/li>\n<li>\u4e8c\u3001\u6307\u9488\u7684\u8d4b\u503c\n<ul>\n<li>\u4e0d\u540c\u7c7b\u578b\u7684\u6307\u9488\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u968f\u610f\u8d4b\u503c&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001void \u6307\u9488\n<ul>\n<li>\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u5b9a\u4e49 void \u6307\u9488&#xff0c;\u5374\u4e0d\u80fd\u5b9a\u4e49 void \u53d8\u91cf&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u7a7a\u6307\u9488\u3001\u91ce\u6307\u9488\u4e0e\u60ac\u7a7a\u6307\u9488\n<ul>\n<li>1. \u7a7a\u6307\u9488<\/li>\n<li>2. \u91ce\u6307\u9488<\/li>\n<li>3. \u60ac\u7a7a\u6307\u9488<\/li>\n<li>4. \u60ac\u7a7a\u6307\u9488\u4e0e\u5185\u5b58\u6cc4\u6f0f\u7684\u533a\u522b<\/li>\n<li>5. \u4e0d\u4e3a\u7a7a&#xff0c;\u4e0d\u4ee3\u8868\u6709\u6548<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u89e3\u5f15\u7528\u4e0e\u53d6\u5730\u5740<\/li>\n<li>\u516d\u3001const \u4e0e\u6307\u9488\n<ul>\n<li>1. \u6307\u5411 const \u9650\u5b9a\u7c7b\u578b\u7684\u6307\u9488<\/li>\n<li>2. \u6307\u9488\u672c\u8eab\u5e26 const \u9650\u5b9a<\/li>\n<li>3. \u4e24\u8fb9\u90fd\u52a0 const<\/li>\n<\/ul>\n<\/li>\n<li>\u4e03\u3001\u4e8c\u7ea7\u6307\u9488<\/li>\n<li>\u516b\u3001\u6307\u9488\u4e0e\u6570\u7ec4\n<ul>\n<li>\u6307\u5411\u9996\u5143\u7d20\u4e0e\u6307\u5411\u6574\u4e2a\u6570\u7ec4<\/li>\n<li>\u6570\u7ec4\u4e0b\u6807\u4e0e\u6307\u9488\u8868\u8fbe\u5f0f<\/li>\n<li>\u6570\u7ec4\u4f5c\u4e3a\u51fd\u6570\u53c2\u6570<\/li>\n<\/ul>\n<\/li>\n<li>\u4e5d\u3001\u6307\u9488\u7684\u5e94\u7528&#xff1a;\u51fd\u6570\u4f20\u53c2<\/li>\n<li>\u5341\u3001\u52a8\u6001\u5185\u5b58\u7ba1\u7406\n<ul>\n<li>1. \u6808\u3001\u5806\u4e0e\u751f\u547d\u5468\u671f<\/li>\n<li>2. \u6307\u9488\u53d8\u91cf\u4e0e\u52a8\u6001\u5185\u5b58\u7684\u751f\u547d\u5468\u671f\u4e0d\u540c<\/li>\n<li>3. \u5185\u5b58\u6cc4\u6f0f<\/li>\n<li>4. malloc\u51fd\u6570<\/li>\n<li>5. calloc\u51fd\u6570<\/li>\n<li>6. realloc\u51fd\u6570<\/li>\n<li>7. free<\/li>\n<\/ul>\n<\/li>\n<li>\u5341\u4e00\u3001\u51fd\u6570\u6307\u9488\u4e0e\u56de\u8c03\n<ul>\n<li>\u56de\u8c03\u793a\u4f8b<\/li>\n<\/ul>\n<\/li>\n<li>\u5341\u4e8c\u3001\u8865\u5145\u95ee\u7b54\n<ul>\n<li>1. \u6307\u9488\u7c7b\u578b\u548c\u6307\u9488\u503c\u6709\u4ec0\u4e48\u533a\u522b&#xff1f;<\/li>\n<li>2. p &#061; q \u4e0e *p &#061; *q \u5206\u522b\u6539\u53d8\u4ec0\u4e48&#xff1f;<\/li>\n<li>3. \u51fd\u6570\u4f20\u53c2\u662f\u526f\u672c&#xff0c;\u4e3a\u4ec0\u4e48\u8fd8\u80fd\u4fee\u6539\u5916\u9762\u7684\u5bf9\u8c61&#xff1f;<\/li>\n<li>4. \u5982\u679c\u60f3\u4fee\u6539\u5916\u9762\u7684\u6307\u9488\u53d8\u91cf\u5462&#xff1f;<\/li>\n<li>5. \u4e24\u7ea7\u89e3\u5f15\u7528\u4e2d&#xff0c;\u64cd\u4f5c\u987a\u5e8f\u4e3a\u4ec0\u4e48\u91cd\u8981&#xff1f;<\/li>\n<li>6. \u53ea\u8bfb\u53d6\u5927\u5bf9\u8c61&#xff0c;\u4e5f\u503c\u5f97\u4f20\u6307\u9488\u5417&#xff1f;<\/li>\n<li>7. \u6307\u9488\u600e\u4e48\u8ba9\u51fd\u6570\u63d0\u4f9b\u591a\u4e2a\u7ed3\u679c&#xff1f;<\/li>\n<li>8. void * \u63a5\u6536 int \u7684\u5730\u5740&#xff0c;\u4f1a\u81ea\u52a8\u53d8\u6210 int * \u5417&#xff1f;<\/li>\n<li>9. \u4e3a\u4ec0\u4e48\u4e0d\u80fd\u628a int \u7684\u5730\u5740\u8f6c\u6210 double *&#xff0c;\u518d\u8bfb\u51fa 10.0&#xff1f;<\/li>\n<li>10. void * \u4e3a\u4ec0\u4e48\u4e0d\u80fd\u76f4\u63a5\u52a0\u4e00&#xff1f;\u5b83\u6709\u4ec0\u4e48\u7528&#xff1f;<\/li>\n<li>11. \u6307\u9488\u4e0a\u7684 const \u4f1a\u628a\u539f\u5bf9\u8c61\u53d8\u6210\u5e38\u91cf\u5417&#xff1f;<\/li>\n<li>12. \u6307\u5411\u6570\u7ec4\u7684\u6307\u9488\u4e0e\u6307\u9488\u6570\u7ec4\u6709\u4ec0\u4e48\u533a\u522b&#xff1f;<\/li>\n<li>13. \u6570\u7ec4\u5b57\u8282\u6570\u4e0e\u5143\u7d20\u4e2a\u6570\u600e\u4e48\u6c42&#xff1f;<\/li>\n<li>14. \u51fd\u6570\u9700\u8981\u6570\u7ec4\u5927\u5c0f\u65f6\u600e\u4e48\u529e&#xff1f;<\/li>\n<li>15. \u6307\u9488\u81ea\u589e\u4e0e\u6240\u6307\u6570\u636e\u81ea\u589e\u600e\u4e48\u533a\u5206&#xff1f;<\/li>\n<li>16. \u6307\u9488\u76f8\u51cf\u5f97\u5230\u7684\u662f\u5b57\u8282\u6570\u5417&#xff1f;<\/li>\n<li>17. \u5c3e\u540e\u6307\u9488\u80fd\u8bfb\u53d6\u5417&#xff1f;<\/li>\n<li>18. \u52a8\u6001\u5185\u5b58\u8fd8\u5728&#xff0c;\u4e3a\u4ec0\u4e48\u4f1a\u627e\u4e0d\u5230&#xff1f;<\/li>\n<li>19. realloc \u5931\u8d25\u548c\u6210\u529f\u5206\u522b\u600e\u6837\u5904\u7406&#xff1f;<\/li>\n<li>20. malloc \u548c calloc \u5f97\u5230\u7684\u7a7a\u95f4\u80fd\u76f4\u63a5\u8bfb\u53d6\u5417&#xff1f;<\/li>\n<li>21. sizeof *p \u4e3a\u4ec0\u4e48\u4e0d\u9700\u8981\u5148\u521d\u59cb\u5316 p&#xff1f;<\/li>\n<li>22. \u51fd\u6570\u8fd4\u56de\u7684\u5730\u5740\u4ec0\u4e48\u65f6\u5019\u4ecd\u7136\u6709\u6548&#xff1f;\u3010\u91cd\u70b9\u3011<\/li>\n<li>23. \u67e5\u627e\u51fd\u6570\u8fd4\u56de\u7684\u6307\u9488\u80fd free \u5417&#xff1f;\u3010\u91cd\u70b9\u3011<\/li>\n<li>24. \u91ca\u653e\u5185\u5b58\u4f1a\u5f71\u54cd\u5176\u4ed6\u6307\u9488\u548c\u6570\u636e\u526f\u672c\u5417&#xff1f;<\/li>\n<li>25. \u51fd\u6570\u6307\u9488\u4e0e\u51fd\u6570\u8c03\u7528\u6709\u4ec0\u4e48\u533a\u522b&#xff1f;<\/li>\n<li>26. \u56de\u8c03\u4e3a\u4ec0\u4e48\u6709\u7528&#xff1f;\u7c7b\u578b\u8981\u6ee1\u8db3\u4ec0\u4e48\u8981\u6c42&#xff1f;<\/li>\n<li>27.\u6307\u9488\u4f7f\u7528\u4e2d\u4e09\u4e2a\u5bb9\u6613\u9057\u6f0f\u7684\u95ee\u9898\n<ul>\n<li>(1) \u58f0\u660e\u6307\u9488&#xff0c;\u4e0d\u4f1a\u81ea\u52a8\u521b\u5efa\u5b83\u6307\u5411\u7684\u5bf9\u8c61<\/li>\n<li>(2) \u4e0b\u6807\u8bbf\u95ee\u4e0e\u6307\u9488\u8bbf\u95ee\u7684\u5173\u7cfb<\/li>\n<li>(3) \u5b57\u7b26\u6570\u7ec4\u4e0e\u6307\u5411\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u7684\u6307\u9488<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u4e00\u3001\u6307\u9488\u542b\u4e49\u4e0e\u7c7b\u578b<\/h3>\n<p>\u6307\u9488\u53d8\u91cf\u4fdd\u5b58\u6307\u9488\u503c&#xff0c;\u53ef\u4ee5\u6307\u5411\u5bf9\u8c61\u6216\u51fd\u6570&#xff0c;\u4e5f\u53ef\u4ee5\u4fdd\u5b58\u7a7a\u6307\u9488\u503c\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc&#xff1a;<\/p>\n<ul>\n<li>a \u662f int \u7c7b\u578b\u7684\u53d8\u91cf&#xff0c;\u4fdd\u5b58\u6574\u6570 10\u3002<\/li>\n<li>p \u662f int * \u7c7b\u578b\u7684\u6307\u9488\u53d8\u91cf&#xff0c;\u4fdd\u5b58 a \u7684\u5730\u5740\u3002<\/li>\n<li>*p \u6307\u4ee3 a\u3002<\/li>\n<\/ul>\n<p>\u6307\u9488\u7c7b\u578b\u3001\u6307\u9488\u503c\u548c\u6240\u6307\u5bf9\u8c61\u7684\u7c7b\u578b\u662f\u4e0d\u540c\u6982\u5ff5\u3002<\/p>\n<table>\n<tr>\u6982\u5ff5\u672c\u4f8b\u4e2d\u7684\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>\u6307\u9488\u53d8\u91cf<\/td>\n<td>p<\/td>\n<\/tr>\n<tr>\n<td>\u6307\u9488\u7c7b\u578b<\/td>\n<td>int *<\/td>\n<\/tr>\n<tr>\n<td>\u6307\u9488\u503c<\/td>\n<td>p \u4fdd\u5b58\u7684 &amp;a<\/td>\n<\/tr>\n<tr>\n<td>\u6240\u6307\u5bf9\u8c61<\/td>\n<td>a<\/td>\n<\/tr>\n<tr>\n<td>\u6240\u6307\u5bf9\u8c61\u7684\u7c7b\u578b<\/td>\n<td>int<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6307\u9488\u7c7b\u578b\u662f\u5bf9\u6307\u9488\u8fd9\u4e00\u53d8\u91cf\u7684\u4e00\u822c\u63cf\u8ff0&#xff0c;\u5b83\u544a\u8bc9\u6211\u4eec\u67d0\u4e2a\u6307\u9488\u7684\u8be6\u7ec6\u5185\u5bb9\u3002<\/p>\n<ul>\n<li>\n<p>int p; \u5b9a\u4e49\u4e00\u4e2a\u6574\u578b\u53d8\u91cf\u3002<\/p>\n<\/li>\n<li>\n<p>int *p p\u5148\u4e0e*\u7ed3\u5408&#xff0c;\u8bf4\u660ep\u662f\u4e00\u4e2a\u6307\u9488\u53d8\u91cf&#xff0c;\u518d\u4e0eint\u7ed3\u5408&#xff0c;\u8bf4\u660e\u6307\u9488\u6307\u5411\u7684\u7c7b\u578b\u662fint\u578b\u3002\u6240\u4ee5\u6211\u4eec\u8bf4&#xff0c;p\u662f\u4e00\u4e2a\u6307\u5411int\u578b\u5bf9\u8c61\u7684\u6307\u9488&#xff0c;\u6307\u5411\u7c7b\u578b\u662fint\u578b&#xff0c;\u6307\u9488\u7c7b\u578b\u8bfb\u4f5c\u201c\u6307\u5411int\u578b\u5bf9\u8c61\u7684\u6307\u9488\u201d&#xff0c;p\u662f\u6307\u9488\u53d8\u91cf\u540d\u3002<\/p>\n<\/li>\n<li>\n<p>int p[3]; p\u5148\u4e0e[3]\u7ed3\u5408&#xff0c;\u8bf4\u660ep\u662f\u4e00\u4e2a\u542b3\u4e2a\u5143\u7d20\u7684\u6570\u7ec4&#xff0c;\u518d\u4e0eint\u7ed3\u5408&#xff0c;\u8bf4\u660e\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u662fint\u578b\u3002\u6240\u4ee5\u6211\u4eec\u8bf4&#xff0c;p\u662f\u4e00\u4e2a\u75313\u4e2aint\u578b\u6570\u636e\u7ec4\u6210\u7684\u6570\u7ec4&#xff0c;p\u662f\u6570\u7ec4\u540d\u3002<\/p>\n<\/li>\n<li>\n<p>int *p[3]; p\u5148\u4e0e[3]\u7ed3\u5408&#xff0c;\u8bf4\u660ep\u662f\u4e00\u4e2a\u542b3\u4e2a\u5143\u7d20\u7684\u6570\u7ec4&#xff0c;\u518d\u4e0e*\u7ed3\u5408&#xff0c;\u8bf4\u660e\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u662f\u6307\u9488&#xff0c;\u7136\u540e\u4e0eint\u7ed3\u5408&#xff0c;\u8bf4\u660e\u6307\u9488\u6307\u5411\u7684\u7c7b\u578b\u662fint\u578b\u3002\u6240\u4ee5\u6211\u4eec\u8bf4&#xff0c;p\u662f\u4e00\u4e2a\u75313\u4e2a\u6307\u5411int\u578b\u5bf9\u8c61\u7684\u6307\u9488\u7ec4\u6210\u7684\u6570\u7ec4&#xff0c;p\u662f\u6570\u7ec4\u540d\u3002\u50cf\u8fd9\u6837&#xff0c;\u5143\u7d20\u662f\u6307\u9488\u7684\u6570\u7ec4\u79f0\u4e3a\u6307\u9488\u6570\u7ec4\u3002<\/p>\n<\/li>\n<li>\n<p>int (*p)[3]; p\u5148\u4e0e*\u7ed3\u5408&#xff0c;\u8bf4\u660ep\u662f\u4e00\u4e2a\u6307\u9488\u53d8\u91cf&#xff0c;\u518d\u4e0e[3]\u7ed3\u5408&#xff0c;\u8bf4\u660e\u6307\u9488\u6307\u5411\u7684\u5bf9\u8c61\u662f\u4e00\u4e2a\u6570\u7ec4&#xff0c;\u7136\u540e\u4e0eint\u7ed3\u5408&#xff0c;\u8bf4\u660e\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u662fint\u578b\u3002\u6240\u4ee5\u6211\u4eec\u8bf4&#xff0c;p\u662f\u4e00\u4e2a\u6307\u5411\u75313\u4e2aint\u578b\u5143\u7d20\u7ec4\u6210\u7684\u6570\u7ec4\u7684\u6307\u9488&#xff0c;\u6307\u9488\u7c7b\u578b\u662f\u201c\u6307\u5411\u75313\u4e2aint\u578b\u5143\u7d20\u7ec4\u6210\u7684\u6570\u7ec4\u7684\u6307\u9488\u201d&#xff0c;\u6307\u5411\u7c7b\u578b\u662f\u6570\u7ec4&#xff0c;p\u662f\u6307\u9488\u53d8\u91cf\u540d\u3002\u50cf\u8fd9\u6837&#xff0c;\u6307\u5411\u6570\u7ec4\u7684\u6307\u9488\u79f0\u4e3a\u6570\u7ec4\u6307\u9488\u3002<\/p>\n<\/li>\n<li>\n<p>int **p; p\u5148\u4e0e\u7ed3\u5408,\u8bf4\u660ep\u662f\u4e00\u4e2a\u6307\u9488\u53d8\u91cf&#xff0c;\u518d\u4e0e\u7ed3\u5408&#xff0c;\u8bf4\u660e\u6307\u9488(*p,\u4e00\u7ea7\u6307\u9488)\u6307\u5411\u7684\u7c7b\u578b\u662f\u6307\u9488(**p,\u4e8c\u7ea7\u6307\u9488)&#xff0c;\u7136\u540e\u518d\u4e0eint\u7ed3\u5408&#xff0c;\u8bf4\u660e(\u4e8c\u7ea7)\u6307\u9488\u6307\u5411\u7684\u7c7b\u578b\u662fint\u578b\u3002\u6240\u4ee5\u6211\u4eec\u8bf4&#xff0c;p\u662f\u4e00\u4e2a\u6307\u5411\u4e8c\u7ea7\u6307\u9488\u7684\u4e00\u7ea7\u6307\u9488&#xff0c;\u5176\u4e2d&#xff0c;\u4e8c\u7ea7\u6307\u9488\u6307\u5411\u7684\u7c7b\u578b\u662fint\u578b&#xff0c;\u4e8c\u7ea7\u6307\u9488\u7684\u6307\u9488\u7c7b\u578b\u662f\u201c\u6307\u5411int\u578b\u5bf9\u8c61\u7684\u6307\u9488\u201d&#xff0c;\u6307\u5411\u7c7b\u578b\u662fint\u578b&#xff0c;\u4e00\u7ea7\u6307\u9488\u7684\u6307\u9488\u7c7b\u578b\u662f\u201c\u6307\u5411\u6307\u9488\u7684\u6307\u9488\u201d&#xff0c;\u6307\u5411\u7c7b\u578b\u662f\u6307\u9488&#xff0c;p\u662f\u4e00\u7ea7\u6307\u9488\u540d&#xff0c;*p\u662f\u4e8c\u7ea7\u6307\u9488\u540d\u3002<\/p>\n<\/li>\n<li>\n<p>int p(int); p\u5148\u4e0e(int)\u7ed3\u5408&#xff0c;\u8bf4\u660ep\u662f\u4e00\u4e2a\u542b1\u4e2aint\u578b\u53c2\u6570\u7684\u51fd\u6570&#xff0c;\u518d\u4e0eint\u7ed3\u5408&#xff0c;\u8bf4\u660e\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662fint\u578b\u3002\u6240\u4ee5\u6211\u4eec\u8bf4&#xff0c;p\u662f\u4e00\u4e2a\u542b1\u4e2aint\u578b\u53c2\u6570\u4e14\u8fd4\u56de\u503c\u4e3aint\u578b\u7684\u51fd\u6570\u3002<\/p>\n<\/li>\n<li>\n<p>int (*p)(int) p\u5148\u4e0e*\u7ed3\u5408&#xff0c;\u8bf4\u660ep\u662f\u4e00\u4e2a\u6307\u9488,\u518d\u4e0e(int)\u7ed3\u5408&#xff0c;\u8bf4\u660e\u6307\u9488\u6307\u5411\u4e00\u4e2a\u51fd\u6570&#xff0c;\u51fd\u6570\u7684\u53c2\u6570\u4e3a1\u4e2aint\u578b\u53c2\u6570&#xff0c;\u7136\u540e\u4e0eint\u7ed3\u5408&#xff0c;\u8bf4\u660e\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662fint\u578b\u3002\u6240\u4ee5\u6211\u4eec\u8bf4&#xff0c;p\u662f\u4e00\u4e2a\u6307\u5411\u4e00\u4e2a\u51fd\u6570\u7684\u6307\u9488&#xff0c;\u5176\u4e2d&#xff0c;\u51fd\u6570\u7684\u53c2\u6570\u548c\u8fd4\u56de\u503c\u662fint\u578b&#xff0c;\u6307\u9488\u7c7b\u578b\u662f\u201c\u6307\u5411\u542b1\u4e2aint\u578b\u53c2\u6570\u4e14\u8fd4\u56de\u503c\u4e3aint\u578b\u7684\u51fd\u6570\u7684\u6307\u9488\u201d&#xff0c;\u6307\u5411\u7c7b\u578b\u4e3a\u51fd\u6570\u3002<\/p>\n<\/li>\n<li>\n<p>int *(*p(int))[3]; p\u5148\u4e0e(int)\u7ed3\u5408&#xff0c;\u8bf4\u660ep\u662f\u4e00\u4e2a\u542b1\u4e2aint\u578b\u53c2\u6570\u7684\u51fd\u6570&#xff0c;\u518d\u4e0e*\u7ed3\u5408&#xff0c;\u8bf4\u660e\u51fd\u6570\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u6307\u9488&#xff0c;\u7136\u540e\u4e0e[3]\u7ed3\u5408&#xff0c;\u8bf4\u660e\u6307\u9488\u6307\u5411\u4e00\u4e2a\u542b3\u4e2a\u5143\u7d20\u7684\u6570\u7ec4&#xff0c;\u6700\u540e\u4e0eint\u7ed3\u5408&#xff0c;\u8bf4\u660e\u5143\u7d20\u7684\u7c7b\u578b\u662fint\u578b\u3002\u6240\u4ee5\u6211\u4eec\u8bf4&#xff0c;p\u662f\u4e00\u4e2a\u542b1\u4e2aint\u578b\u53c2\u6570\u4e14\u8fd4\u56de\u4e00\u4e2a\u6307\u9488\u7684\u51fd\u6570&#xff0c;\u5176\u4e2d&#xff0c;\u6307\u9488\u6307\u5411\u4e00\u4e2a\u75313\u4e2aint\u578b\u5143\u7d20\u7ec4\u6210\u7684\u6570\u7ec4\u3002&#xff08;\u5b8c\u5168\u957f\u96be\u53e5\u6765\u7684&#xff09;<\/p>\n<\/li>\n<\/ul>\n<p>\u6307\u9488\u6240\u6307\u7c7b\u578b\u51b3\u5b9a\u7f16\u8bd1\u5668\u5982\u4f55\u770b\u5f85\u5b83\u6307\u5411\u7684\u5bf9\u8c61&#xff0c;\u4e5f\u51b3\u5b9a\u6307\u9488\u52a0\u51cf\u6574\u6570\u65f6\u7684\u6b65\u957f\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>q<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>p &#043; 1 \u8de8\u8fc7\u4e00\u4e2a int&#xff0c;\u6b65\u957f\u4e3a sizeof(int) \u5b57\u8282\u3002<\/li>\n<li>q &#043; 1 \u8de8\u8fc7\u6574\u4e2a\u6570\u7ec4&#xff0c;\u6b65\u957f\u4e3a sizeof(int[5]) \u5b57\u8282\u3002<\/li>\n<\/ul>\n<p>\u4e0d\u80fd\u628a int \u56fa\u5b9a\u5199\u6210 4 \u5b57\u8282\u3002\u6307\u9488\u672c\u8eab\u5360\u591a\u5c11\u5b57\u8282&#xff0c;\u4e0e\u6307\u9488\u52a0\u4e00\u7684\u6b65\u957f\u662f\u4e24\u4ef6\u4e8b\u3002\u6307\u9488\u8fd0\u7b97\u8fd8\u5fc5\u987b\u9075\u5b88\u6570\u7ec4\u8fb9\u754c\u7b49\u89c4\u5219&#xff0c;\u4e0d\u80fd\u968f\u610f\u79fb\u52a8\u3002<\/p>\n<p>\u6307\u9488\u7684\u503c\u662f\u6307\u9488\u672c\u8eab\u5b58\u50a8\u7684\u503c&#xff0c;\u8fd9\u4e2a\u503c\u88ab\u7f16\u8bd1\u7cfb\u7edf\u89e3\u91ca\u4e3a\u5730\u5740&#xff0c;\u8fd9\u4e2a\u5730\u5740\u53ef\u4ee5\u770b\u4f5c\u5185\u5b58\u7f16\u53f7\u3002\u53ef\u4ee5\u8bf4&#xff0c;\u6307\u9488\u7684\u503c\u5c31\u662f\u5b83\u6307\u5411\u7684\u5185\u5b58\u533a&#xff08;\u5730\u5740&#xff09;\u3002\u6307\u9488\u6307\u5411\u7684\u662f\u5185\u5b58\u4e2d\u67d0\u7247\u5185\u5b58\u533a\u7684\u9996\u5730\u5740&#xff0c;\u6307\u9488\u7684\u6307\u5411\u7c7b\u578b\u51b3\u5b9a\u4e86\u7f16\u8bd1\u7cfb\u7edf\u600e\u6837\u770b\u5f85\u8fd9\u7247\u5185\u5b58\u533a&#xff0c;\u82e5\u6307\u5411\u7c7b\u578b\u4e3aint\u578b&#xff0c;\u5219\u7f16\u8bd1\u7cfb\u7edf\u5c06\u8fd9\u7247\u5185\u5b58\u533a\u770b\u4f5cint\u578b&#xff0c;\u5982\u679c\u6211\u4eec\u8981\u8bbf\u95ee\u8fd9\u7247\u5185\u5b58\u533a\u5e76\u8bfb\u53d6\u6570\u636e&#xff0c;\u90a3\u4e48\u7f16\u8bd1\u7cfb\u7edf\u5c06\u4f1a\u8fde\u7eed\u8bfb\u53d6\u5305\u62ec\u9996\u5730\u5740\u5728\u5185\u76844\u4e2a\u5b57\u8282\u7684\u5b58\u50a8\u5355\u5143\u3002\u540c\u7406&#xff0c;\u82e5\u6307\u5411\u7c7b\u578b\u4e3adouble\u578b&#xff0c;\u90a3\u4e48\u8fde\u7eed\u8bfb\u53d68\u4e2a\u5b57\u8282\u7684\u5b58\u50a8\u5355\u5143\u3002&#xff08;\u901a\u5e38\u572832\u4f4d\u7a0b\u5e8f\u4e2d&#xff0c;int\u578b\u6570\u636e\u7684\u957f\u5ea6\u4e3a4\u5b57\u8282&#xff0c;double\u578b\u6570\u636e\u7684\u957f\u5ea6\u4e3a8\u5b57\u8282\u3002&#xff09;<\/p>\n<h3>\u4e8c\u3001\u6307\u9488\u7684\u8d4b\u503c<\/h3>\n<p>\u7c7b\u578b\u517c\u5bb9\u7684\u6307\u9488\u53ef\u4ee5\u76f8\u4e92\u8d4b\u503c\u3002\u591a\u6570\u8868\u8fbe\u5f0f\u4e2d\u7684\u6570\u7ec4\u4f1a\u8f6c\u6362\u4e3a\u6307\u5411\u9996\u5143\u7d20\u7684\u6307\u9488&#xff0c;\u4e5f\u53ef\u4ee5\u7528\u6765\u7ed9\u7c7b\u578b\u5408\u9002\u7684\u6307\u9488\u8d4b\u503c\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> p<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6b64\u65f6&#xff0c;p \u548c q \u90fd\u6307\u5411 a\u3002<\/p>\n<p>\u590d\u5236\u7684\u662f\u5730\u5740&#xff0c;\u4e0d\u4f1a\u590d\u5236\u6240\u6307\u5bf9\u8c61\u3002<\/p>\n<p><span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4fee\u6539\u7684\u662f a&#xff0c;\u56e0\u6b64\u901a\u8fc7 p \u8bfb\u53d6\u4e5f\u4f1a\u5f97\u5230 20\u3002<\/p>\n<p>\u4f46\u662f&#xff1a;<\/p>\n<p>q <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53ea\u6539\u53d8 q&#xff0c;\u4e0d\u4f1a\u8ba9 p \u4e5f\u53d8\u6210\u7a7a\u6307\u9488\u3002<\/p>\n<p>\u4e24\u4e2a\u6307\u9488\u4fdd\u5b58\u76f8\u540c\u5730\u5740&#xff0c;\u4ecd\u7136\u662f\u4e24\u4e2a\u72ec\u7acb\u53d8\u91cf\u3002\u6307\u9488\u8d4b\u503c\u4e5f\u4e0d\u53ea\u9650\u4e8e\u5b8c\u5168\u76f8\u540c\u7684\u7c7b\u578b&#xff0c;\u4f8b\u5982\u53ef\u4ee5\u7ed9\u6240\u6307\u7c7b\u578b\u589e\u52a0 const \u9650\u5b9a&#xff0c;\u4ee5\u53ca\u8fdb\u884c C \u8bed\u8a00\u5141\u8bb8\u7684 void * \u8f6c\u6362\u3002<\/p>\n<h4>\u4e0d\u540c\u7c7b\u578b\u7684\u6307\u9488\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u968f\u610f\u8d4b\u503c&#xff1f;<\/h4>\n<p><span class=\"token keyword\">char<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>pc <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>c<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ int *pi &#061; pc;  \/\/ \u7c7b\u578b\u4e0d\u517c\u5bb9&#xff0c;\u4e0d\u80fd\u8fd9\u6837\u76f4\u63a5\u8d4b\u503c<\/span><\/p>\n<p>pc \u6307\u5411\u7684\u662f\u4e00\u4e2a char \u5bf9\u8c61\u3002\u5373\u4f7f\u4f7f\u7528\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362&#xff0c;\u4e5f\u4e0d\u4f1a\u628a\u8fd9\u4e2a\u5bf9\u8c61\u53d8\u6210 int&#xff0c;\u66f4\u4e0d\u4f1a\u4e3a\u5b83\u589e\u52a0\u5b58\u50a8\u7a7a\u95f4\u3002<\/p>\n<p>\u5047\u8bbe\u67d0\u4e2a\u5b9e\u73b0\u4e2d\u7684 int \u5360 4 \u5b57\u8282&#xff0c;\u800c char \u5360 1 \u5b57\u8282&#xff0c;\u90a3\u4e48\u901a\u8fc7 int * \u8bbf\u95ee\u8fd9\u4e2a char \u5bf9\u8c61&#xff0c;\u5c31\u4e0d\u80fd\u7b80\u5355\u7406\u89e3\u4e3a\u201c\u628a 10 \u5f53\u4f5c int \u8bfb\u51fa\u6765\u201d\u3002<\/p>\n<p>\u66f4\u51c6\u786e\u5730\u8bf4&#xff1a;\u95ee\u9898\u4e0d\u53ea\u5728\u4e8e\u5b57\u8282\u6570&#xff0c;\u8fd8\u6d89\u53ca\u5bf9\u9f50\u8981\u6c42\u548c\u5141\u8bb8\u7684\u8bbf\u95ee\u7c7b\u578b\u3002\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u4e0d\u4f1a\u521b\u5efa\u65b0\u5bf9\u8c61&#xff0c;\u4e5f\u4e0d\u662f\u8ba9\u9519\u8bef\u8bbf\u95ee\u53d8\u5408\u6cd5\u7684\u529e\u6cd5\u3002<\/p>\n<p>&#xff08;\u5728C\u8bed\u8a00\u4e2d&#xff0c;\u5bf9\u9f50\u6307\u7684\u662f\u6570\u636e\u5728\u5185\u5b58\u4e2d\u5b58\u653e\u65f6&#xff0c;\u5176\u8d77\u59cb\u5730\u5740\u5fc5\u987b\u662f\u67d0\u4e2a\u503c\u7684\u6574\u6570\u500d\u3002\u8fd9\u4e2a\u503c\u901a\u5e38\u662f2\u30014\u30018\u7b49&#xff0c;\u5177\u4f53\u53d6\u51b3\u4e8e\u6570\u636e\u7c7b\u578b\u548c\u786c\u4ef6\u5e73\u53f0&#xff09;<\/p>\n<h3>\u4e09\u3001void \u6307\u9488<\/h3>\n<p>void * \u662f\u901a\u7528\u5bf9\u8c61\u6307\u9488\u7c7b\u578b&#xff0c;\u4e0d\u6307\u5b9a\u6240\u6307\u5bf9\u8c61\u7684\u5177\u4f53\u7c7b\u578b\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> p<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc&#xff1a;<\/p>\n<ul>\n<li>p \u7684\u7c7b\u578b\u59cb\u7ec8\u662f void *\u3002<\/li>\n<li>q \u7684\u7c7b\u578b\u662f int *\u3002<\/li>\n<li>a \u7684\u7c7b\u578b\u4ecd\u7136\u662f int\u3002<\/li>\n<\/ul>\n<p>\u628a int \u5bf9\u8c61\u7684\u5730\u5740\u4ea4\u7ed9 void *&#xff0c;\u4e0d\u4f1a\u4f7f\u8fd9\u4e2a\u6307\u9488\u53d8\u91cf\u81ea\u52a8\u53d8\u6210 int *\u3002<\/p>\n<p>void * \u672c\u8eab\u5c31\u662f\u786e\u5b9a\u7684\u6307\u9488\u7c7b\u578b&#xff0c;\u4e0d\u662f\u201c\u7c7b\u578b\u5c1a\u672a\u786e\u5b9a\u201d\u3002\u5b83\u4e0d\u4f1a\u81ea\u52a8\u8bb0\u5f55\u5bf9\u8c61\u7c7b\u578b\u6216\u5143\u7d20\u4e2a\u6570&#xff0c;\u8fd9\u4e9b\u4fe1\u606f\u9700\u8981\u901a\u8fc7\u63a5\u53e3\u7ea6\u5b9a\u6216\u989d\u5916\u53c2\u6570\u4f20\u9012\u3002&#xff08;\u8fd9\u91cc\u7684\u63a5\u53e3&#xff0c;\u6307\u7684\u662f\u51fd\u6570\u8c03\u7528\u7684\u5165\u53e3&#xff09;<\/p>\n<p>\u5728 C \u4e2d&#xff0c;void * \u4e0e\u5176\u4ed6\u5bf9\u8c61\u6307\u9488\u4e4b\u95f4\u7684\u8bb8\u591a\u8f6c\u6362\u53ef\u4ee5\u9690\u5f0f\u5b8c\u6210&#xff0c;\u4e0d\u5fc5\u603b\u5199\u5f3a\u5236\u8f6c\u6362\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u5728 C \u4e2d\u4e0d\u9700\u8981\u5199\u6210&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4f7f\u7528 malloc \u65f6\u9700\u8981\u5305\u542b &lt;stdlib.h&gt;\u3002&#xff08;malloc\u51fd\u6570\u5c06\u5728\u672c\u6587\u540e\u534a\u90e8\u5206\u8bb2\u89e3&#xff09;<\/p>\n<h4>\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u5b9a\u4e49 void \u6307\u9488&#xff0c;\u5374\u4e0d\u80fd\u5b9a\u4e49 void \u53d8\u91cf&#xff1f;<\/h4>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u5408\u6cd5<\/span><br \/>\n<span class=\"token comment\">\/\/ void a; \/\/ \u4e0d\u5408\u6cd5<\/span><\/p>\n<p>\u7f16\u8bd1\u5668\u77e5\u9053 void * \u7c7b\u578b\u9700\u8981\u591a\u5c11\u5b58\u50a8\u7a7a\u95f4&#xff0c;\u56e0\u6b64\u53ef\u4ee5\u5b9a\u4e49\u8fd9\u79cd\u6307\u9488\u53d8\u91cf\u3002<\/p>\n<p>\u800c void \u662f\u4e0d\u80fd\u8865\u5168\u7684\u4e0d\u5b8c\u6574\u7c7b\u578b&#xff0c;\u4e0d\u80fd\u7528\u6765\u5b9a\u4e49\u5bf9\u8c61\u3002<\/p>\n<p>\u6807\u51c6 C \u4e0d\u5141\u8bb8\u5bf9 void * \u76f4\u63a5\u8fdb\u884c\u52a0\u51cf\u8fd0\u7b97&#xff0c;\u4e5f\u4e0d\u80fd\u901a\u8fc7\u5b83\u76f4\u63a5\u8bfb\u53d6\u67d0\u4e2a\u5177\u4f53\u7c7b\u578b\u7684\u5bf9\u8c61\u503c\u3002\u4f7f\u7528\u524d&#xff0c;\u5e94\u8f6c\u6362\u4e3a\u5408\u9002\u7684\u5bf9\u8c61\u6307\u9488\u7c7b\u578b\u3002<\/p>\n<p>void * \u9002\u5408\u9700\u8981\u652f\u6301\u591a\u79cd\u5bf9\u8c61\u7c7b\u578b\u7684\u63a5\u53e3&#xff0c;\u4f8b\u5982\u52a8\u6001\u5185\u5b58\u5206\u914d\u51fd\u6570\u3002\u82e5\u51fd\u6570\u660e\u786e\u53ea\u5904\u7406 int&#xff0c;\u76f4\u63a5\u4f7f\u7528 int * \u901a\u5e38\u66f4\u6e05\u695a&#xff0c;\u4e5f\u80fd\u4fdd\u7559\u66f4\u591a\u7c7b\u578b\u68c0\u67e5\u3002<\/p>\n<h3>\u56db\u3001\u7a7a\u6307\u9488\u3001\u91ce\u6307\u9488\u4e0e\u60ac\u7a7a\u6307\u9488<\/h3>\n<p>\u4e09\u8005\u4e3b\u8981\u533a\u522b\u662f&#xff1a;\u7a7a\u6307\u9488\u660e\u786e\u4e0d\u6307\u5411\u5bf9\u8c61&#xff1b;\u672a\u521d\u59cb\u5316\u7684\u201c\u91ce\u6307\u9488\u201d\u6ca1\u6709\u53ef\u7528\u7684\u786e\u5b9a\u6307\u5411&#xff1b;\u60ac\u7a7a\u6307\u9488\u66fe\u7ecf\u6307\u5411\u6709\u6548\u5bf9\u8c61&#xff0c;\u4f46\u90a3\u4e2a\u5bf9\u8c61\u5df2\u7ecf\u7ed3\u675f\u751f\u547d\u5468\u671f\u3002<\/p>\n<table>\n<tr>\u540d\u79f0\u5178\u578b\u60c5\u51b5\u80fd\u5426\u89e3\u5f15\u7528<\/tr>\n<tbody>\n<tr>\n<td>\u7a7a\u6307\u9488<\/td>\n<td>int *p &#061; NULL;<\/td>\n<td>\u4e0d\u80fd<\/td>\n<\/tr>\n<tr>\n<td>\u91ce\u6307\u9488<\/td>\n<td>\u666e\u901a\u5c40\u90e8\u6307\u9488\u672a\u521d\u59cb\u5316<\/td>\n<td>\u4e0d\u80fd<\/td>\n<\/tr>\n<tr>\n<td>\u60ac\u7a7a\u6307\u9488<\/td>\n<td>\u6240\u6307\u5185\u5b58\u5df2\u91ca\u653e&#xff0c;\u6216\u5c40\u90e8\u5bf9\u8c61\u5df2\u5931\u6548<\/td>\n<td>\u4e0d\u80fd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u201c\u91ce\u6307\u9488\u201d\u662f\u975e\u6b63\u5f0f\u53eb\u6cd5&#xff0c;\u6709\u65f6\u4e5f\u6cdb\u6307\u5176\u4ed6\u65e0\u6548\u6307\u9488&#xff0c;\u5305\u62ec\u60ac\u7a7a\u6307\u9488\u3002\u8fd9\u91cc\u4e3b\u8981\u7528\u5b83\u63cf\u8ff0\u672a\u521d\u59cb\u5316\u7684\u6307\u9488\u3002<\/p>\n<h4>1. \u7a7a\u6307\u9488<\/h4>\n<p>\u7a7a\u6307\u9488\u660e\u786e\u8868\u793a\u6682\u65f6\u6ca1\u6709\u6307\u5411\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>p\u4ecd\u7136\u662fint*\u7c7b\u578b&#xff0c;\u53ea\u662f\u4fdd\u5b58\u4e86\u7a7a\u6307\u9488\u503c\u3002\u53ef\u4ee5\u5224\u65ad\u5b83\u662f\u5426\u4e3a\u7a7a&#xff0c;\u4f46\u4e0d\u80fd\u901a\u8fc7\u5b83\u8bfb\u53d6\u6216\u5199\u5165&#xff1a;<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u76ee\u524d\u6ca1\u6709\u6307\u5411\u5bf9\u8c61\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ *p &#061; 10;  \/\/ \u9519\u8bef<\/span><\/p>\n<p>malloc\u7533\u8bf7\u5931\u8d25\u4e5f\u4f1a\u8fd4\u56de\u7a7a\u6307\u9488\u3002free(NULL)\u5408\u6cd5&#xff0c;\u4e0d\u6267\u884c\u91ca\u653e\u3002<\/p>\n<p>\u4e0d\u8981\u628a\u7a7a\u6307\u9488\u7b80\u5355\u7406\u89e3\u4e3a\u201c\u53ef\u4ee5\u8bbf\u95ee\u7684\u7f16\u53f7\u4e3a0\u7684\u5185\u5b58\u201d&#xff0c;\u4e5f\u4e0d\u5fc5\u5047\u5b9a\u5b83\u5728\u5185\u5b58\u4e2d\u4e00\u5b9a\u4ee5\u5168\u96f6\u4f4d\u8868\u793a\u3002<\/p>\n<h4>2. \u91ce\u6307\u9488<\/h4>\n<p>\u91ce\u6307\u9488\u7684\u5e38\u89c1\u6765\u6e90\u662f\u666e\u901a\u5c40\u90e8\u6307\u9488\u6ca1\u6709\u521d\u59cb\u5316&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ *p &#061; 10;  \/\/ \u9519\u8bef<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u58f0\u660ep\u53ea\u521b\u5efa\u4e86\u6307\u9488\u53d8\u91cf&#xff0c;\u6ca1\u6709\u81ea\u52a8\u521b\u5efa\u4e00\u4e2a\u4f9b\u5b83\u6307\u5411\u7684int\u5bf9\u8c61\u3002\u6b64\u65f6\u4e0d\u80fd\u8bfb\u53d6p\u7684\u503c\u6765\u5224\u65ad\u5b83\u201c\u78b0\u5de7\u6307\u5411\u54ea\u91cc\u201d&#xff0c;\u5e94\u5148\u8d4b\u4e88\u6709\u6548\u5730\u5740\u6216NULL\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\np <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u521d\u59cb\u5316\u4e3aNULL\u4fbf\u4e8e\u660e\u786e\u72b6\u6001&#xff0c;\u4f46\u4ecd\u4e0d\u80fd\u89e3\u5f15\u7528&#xff1b;\u53ea\u6709\u53d6\u5f97\u5408\u9002\u7684\u6709\u6548\u5730\u5740\u540e&#xff0c;\u624d\u80fd\u8fdb\u884c\u5bf9\u5e94\u8bbf\u95ee\u3002<\/p>\n<h4>3. \u60ac\u7a7a\u6307\u9488<\/h4>\n<p>\u60ac\u7a7a\u6307\u9488\u66fe\u7ecf\u6307\u5411\u6709\u6548\u5bf9\u8c61&#xff0c;\u4f46\u5bf9\u8c61\u5df2\u7ecf\u7ed3\u675f\u751f\u547d\u5468\u671f\u3002<\/p>\n<p>\u4e00\u79cd\u60c5\u51b5\u662f\u52a8\u6001\u5185\u5b58\u88ab\u91ca\u653e&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> p<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ q\u4e0d\u4f1a\u81ea\u52a8\u53d8\u6210NULL&#xff0c;\u4f46\u5df2\u4e0d\u80fd\u8bbf\u95ee\u539f\u5bf9\u8c61<\/span><br \/>\n    q <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>free\u91ca\u653e\u7684\u662f\u5185\u5b58\u5757&#xff0c;\u4e0d\u4f1a\u81ea\u52a8\u4fee\u6539\u6240\u6709\u4fdd\u5b58\u4e86\u76f8\u5173\u5730\u5740\u7684\u6307\u9488\u3002\u91ca\u653e\u540e\u4e0d\u80fd\u901a\u8fc7q\u8bbf\u95ee\u539f\u5bf9\u8c61&#xff0c;\u4e5f\u4e0d\u80fd\u518d\u6b21free(q)\u3002<\/p>\n<p>\u53e6\u4e00\u79cd\u60c5\u51b5\u662f\u666e\u901a\u5c40\u90e8\u5bf9\u8c61\u7ed3\u675f\u751f\u547d\u5468\u671f&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u6b64\u65f6\u6709\u6548<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ a\u7684\u751f\u547d\u5468\u671f\u7ed3\u675f&#xff0c;p\u6210\u4e3a\u60ac\u7a7a\u6307\u9488<\/span><br \/>\np <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4fdd\u5b58\u5bf9\u8c61\u7684\u5730\u5740\u4e0d\u4f1a\u5ef6\u957f\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u3002\u5373\u4f7f\u539f\u6765\u7684\u6570\u636e\u78b0\u5de7\u8fd8\u6b8b\u7559\u5728\u5185\u5b58\u4e2d&#xff0c;\u4e5f\u4e0d\u80fd\u636e\u6b64\u7ee7\u7eed\u8bbf\u95ee\u3002<\/p>\n<h4>4. \u60ac\u7a7a\u6307\u9488\u4e0e\u5185\u5b58\u6cc4\u6f0f\u7684\u533a\u522b<\/h4>\n<ul>\n<li>\u60ac\u7a7a\u6307\u9488&#xff1a;\u6240\u6307\u5bf9\u8c61\u5df2\u7ecf\u5931\u6548&#xff0c;\u6307\u9488\u6ca1\u6709\u81ea\u52a8\u53d8\u6210NULL\u3002<\/li>\n<\/ul>\n<ul>\n<li>\u5178\u578b\u5185\u5b58\u6cc4\u6f0f&#xff1a;\u52a8\u6001\u5185\u5b58\u8fd8\u6ca1\u91ca\u653e&#xff0c;\u5374\u4e22\u5931\u4e86\u6240\u6709\u8bbf\u95ee\u9014\u5f84\u3002<\/li>\n<\/ul>\n<p>\u53e6\u5916&#xff0c;\u4e0d\u518d\u9700\u8981\u7684\u52a8\u6001\u5185\u5b58\u56e0\u7a0b\u5e8f\u758f\u6f0f\u957f\u671f\u672a\u91ca\u653e&#xff0c;\u4e5f\u53ef\u80fd\u6784\u6210\u6cc4\u6f0f&#xff0c;\u5373\u4f7f\u5730\u5740\u4ecd\u7136\u53ef\u8fbe\u3002&#xff08;\u5185\u5b58\u6cc4\u6f0f\u5c06\u5728\u672c\u6587\u540e\u534a\u90e8\u5206\u8be6\u7ec6\u8bb2\u89e3&#xff09;<\/p>\n<h4>5. \u4e0d\u4e3a\u7a7a&#xff0c;\u4e0d\u4ee3\u8868\u6709\u6548<\/h4>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4e0d\u80fd\u4ec5\u51ed\u8fd9\u4e2a\u6761\u4ef6&#xff0c;\u5c31\u65ad\u5b9a*p\u53ef\u4ee5\u8bbf\u95ee<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5224\u65ad\u4e0d\u4e3a\u7a7a&#xff0c;\u53ea\u80fd\u6392\u9664\u7a7a\u6307\u9488&#xff0c;\u4e0d\u80fd\u8bc1\u660e\u6307\u9488\u6709\u6548\u3002<\/p>\n<p>\u5b83\u4e0d\u80fd\u6392\u9664\u60ac\u7a7a\u3001\u8d8a\u754c\u7b49\u95ee\u9898&#xff1b;\u672a\u521d\u59cb\u5316\u7684\u6307\u9488\u66f4\u4e0d\u80fd\u5148\u62ff\u6765\u505a\u8fd9\u79cd\u68c0\u67e5\u3002\u6307\u9488\u662f\u5426\u53ef\u7528&#xff0c;\u8fd8\u8981\u770b\u6240\u6307\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u3001\u8bbf\u95ee\u8303\u56f4\u3001\u7c7b\u578b\u7b49\u6761\u4ef6\u3002<\/p>\n<h3>\u4e94\u3001\u89e3\u5f15\u7528\u4e0e\u53d6\u5730\u5740<\/h3>\n<p>\u58f0\u660e\u4e2d\u7684 * \u4e0e\u8868\u8fbe\u5f0f\u4e2d\u7684 *&#xff0c;\u4f5c\u7528\u4e0d\u540c\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u7684 * \u662f\u58f0\u660e\u7684\u4e00\u90e8\u5206&#xff0c;\u8bf4\u660e p \u662f\u6307\u9488\u53d8\u91cf\u3002<\/p>\n<p><span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u7684 * \u662f\u89e3\u5f15\u7528\u8fd0\u7b97\u7b26&#xff0c;*p \u6307\u4ee3 p \u6307\u5411\u7684\u5bf9\u8c61\u3002<\/p>\n<table>\n<tr>\u8868\u8fbe\u5f0f\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>p<\/td>\n<td>\u6307\u9488\u53d8\u91cf\u4fdd\u5b58\u7684\u6307\u9488\u503c<\/td>\n<\/tr>\n<tr>\n<td>*p<\/td>\n<td>\u6307\u9488\u6307\u5411\u7684\u5bf9\u8c61<\/td>\n<\/tr>\n<tr>\n<td>&amp;p<\/td>\n<td>\u6307\u9488\u53d8\u91cf p \u81ea\u8eab\u7684\u5730\u5740<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8bfb\u53d6 a \u7684\u503c&#xff0c;\u521d\u59cb\u5316 b<\/span><br \/>\n<span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u4fee\u6539 a<\/span><\/p>\n<p>\u89e3\u5f15\u7528\u4e0d\u4e00\u5b9a\u662f\u5728\u201c\u53d6\u51fa\u4e00\u4e2a\u6570\u201d&#xff0c;\u4e5f\u53ef\u4ee5\u7528\u6765\u6307\u4ee3\u4e00\u4e2a\u5bf9\u8c61&#xff0c;\u518d\u5bf9\u8fd9\u4e2a\u5bf9\u8c61\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<p>\u89e3\u5f15\u7528\u540e\u6307\u4ee3\u7684\u5bf9\u8c61\u53ef\u4ee5\u662f\u6574\u6570\u3001\u7ed3\u6784\u4f53\u3001\u6307\u9488\u53d8\u91cf&#xff0c;\u751a\u81f3\u6574\u4e2a\u6570\u7ec4\u3002\u662f\u5426\u5b9e\u9645\u8bfb\u53d6\u6240\u6307\u5bf9\u8c61&#xff0c;\u8fd8\u8981\u770b\u8868\u8fbe\u5f0f\u4e0a\u4e0b\u6587\u3002\u4f8b\u5982&#xff0c;\u5f53 p \u662f int * \u65f6&#xff0c;sizeof *p \u4e0d\u4f1a\u5b9e\u9645\u8bfb\u53d6 p \u6307\u5411\u7684\u5bf9\u8c61\u3002<\/p>\n<p>\u4e0b\u9762\u63d0\u4f9b\u4e00\u4e2a\u7406\u89e3\u6a21\u578b&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5148\u5b9a\u4e49\u4e00\u4e2a\u6574\u578b\u6570\u7ec4<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5b9a\u4e49\u6307\u9488\u53d8\u91cfp&#xff0c;\u5e76\u5c06\u53d8\u91cfa\u7684\u5730\u5740\u5b58\u5165\u6307\u9488\u53d8\u91cfp<\/span><br \/>\n<span class=\"token keyword\">int<\/span> ptr<span class=\"token operator\">&#061;<\/span><span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5b9a\u4e49\u6574\u578b\u53d8\u91cfptr&#xff0c;\u5e76\u5c06\u6307\u9488\u53d8\u91cf\u7684\u503c\u5b58\u5165\u6574\u578b\u53d8\u91cfptr<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>ptr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>ptr<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u53c8\u662fptr\u53c8\u662f*ptr\u7684&#xff0c;\u751a\u81f3\u8fd8\u6709**ptr&#xff0c;\u6211\u4eec\u8be5\u600e\u6837\u7406\u89e3\u5b83\u4eec\u5462&#xff1f;\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u53bb\u7406\u89e3&#xff1a;*p\u5c31\u662f\u524d\u5f80p\u6307\u5411\u7684\u5730\u5740&#xff0c;\u5373a[0]\u7684\u5730\u5740&#xff0c;\u8bfb\u53d6\u6570\u636e&#xff0c;\u5f97\u5230a[0]\u5b58\u653e\u7684\u6574\u6570&#xff0c;ptr\u5c31\u662f\u524d\u5f80ptr\u6307\u5411\u7684\u5730\u5740&#xff0c;\u5373p\u7684\u5730\u5740&#xff0c;\u8bfb\u53d6\u6570\u636e&#xff0c;\u5f97\u5230a[0]\u7684\u5730\u5740&#xff0c;**ptr\u5c31\u662f\u524d\u5f80ptr\u6307\u5411\u7684\u5730\u5740&#xff0c;\u5373p\u7684\u5730\u5740&#xff0c;\u8bfb\u53d6\u6570\u636e&#xff0c;\u5f97\u5230a[0]\u7684\u5730\u5740&#xff0c;\u518d\u524d\u5f80a[0]\u7684\u5730\u5740&#xff0c;\u8bfb\u53d6\u6570\u636e&#xff0c;\u5f97\u5230a[0]\u5b58\u653e\u7684\u6574\u6570&#xff0c;\u66f4\u7b80\u5355\u5730\u8bf4&#xff0c;**ptr&#061;*(*ptr)&#xff0c;**ptr\u5c31\u662f\u5728\u3001*ptr\u5f97\u5230\u7684\u7ed3\u679c\u7684\u57fa\u7840\u4e0a\u518d\u524d\u5f80\u5730\u5740\u5e76\u8bfb\u53d6\u6570\u636e\u3002\u4e5f\u5c31\u662f&#xff1a;<\/p>\n<p>p<span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">*<\/span>p<span class=\"token operator\">&#061;<\/span>a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\nptr<span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&amp;<\/span>p<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">*<\/span>ptr<span class=\"token operator\">&#061;<\/span>p<span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>ptr<span class=\"token operator\">&#061;<\/span><span class=\"token operator\">*<\/span>p<span class=\"token operator\">&#061;<\/span>a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7531\u6b64&#xff0c;\u6211\u4eec\u53ef\u4ee5\u63d0\u70bc\u51fa\u4e00\u4e2a\u7b80\u5355\u7684\u7406\u89e3\u6a21\u578b&#xff0c;\u5373\u201c\u524d\u5f80\u5730\u5740\u5e76\u8bfb\u53d6\u6570\u636e\u201d\u3002\u5f53\u7136&#xff0c;\u66f4\u51c6\u786e\u5730\u8bf4&#xff0c;\u89e3\u5f15\u7528\u662f\u201c\u6839\u636e\u5730\u5740\u627e\u5230\u5bf9\u8c61\u201d&#xff0c;\u627e\u5230\u540e\u65e2\u53ef\u4ee5\u8bfb\u53d6&#xff0c;\u4e5f\u53ef\u4ee5\u4fee\u6539\u3002<\/p>\n<p>\u6ce8\u610f&#xff0c;\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d&#xff0c;int *ptr\u548cint **ptr\u662f\u4e00\u79cd\u58f0\u660e&#xff0c;\u5206\u522b\u58f0\u660eptr\u89e3\u5f15\u7528\u540e\u7684\u7ed3\u679c\u662fint\u578b&#xff0c;*ptr\u89e3\u5f15\u7528\u540e\u7684\u7ed3\u679c\u662fint *\u578b\u3002<\/p>\n<h3>\u516d\u3001const \u4e0e\u6307\u9488<\/h3>\n<p>\u5e26const\u5173\u952e\u5b57\u7684\u6307\u9488\u6709\u4e0d\u540c\u79cd\u3002<\/p>\n<h4>1. \u6307\u5411 const \u9650\u5b9a\u7c7b\u578b\u7684\u6307\u9488<\/h4>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e0d\u80fd\u901a\u8fc7 p \u4fee\u6539\u6240\u6307\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ *p &#061; 30; \/\/ \u4e0d\u5408\u6cd5<\/span><\/p>\n<p>\u4f46\u662f\u53ef\u4ee5\u4fee\u6539 p \u7684\u6307\u5411&#xff1a;<\/p>\n<p>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>b<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e5f\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u5408\u6cd5\u65b9\u5f0f\u4fee\u6539\u539f\u672c\u53ef\u4fee\u6539\u7684\u5bf9\u8c61&#xff1a;<\/p>\n<p>a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u9650\u5236\u7684\u662f\u901a\u8fc7 p \u4fee\u6539\u5bf9\u8c61&#xff0c;\u4e0d\u662f\u628a a \u672c\u8eab\u53d8\u6210\u5e38\u91cf\u3002<\/p>\n<h4>2. \u6307\u9488\u672c\u8eab\u5e26 const \u9650\u5b9a<\/h4>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token keyword\">const<\/span> p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p>p \u672c\u8eab\u4e0d\u80fd\u518d\u4fdd\u5b58\u5176\u4ed6\u5730\u5740&#xff0c;\u4f46\u53ef\u4ee5\u901a\u8fc7\u5b83\u4fee\u6539 a&#xff1a;<\/p>\n<p><span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u5408\u6cd5<\/span><br \/>\n<span class=\"token comment\">\/\/ p &#061; NULL; \/\/ \u4e0d\u5408\u6cd5<\/span><\/p>\n<h4>3. \u4e24\u8fb9\u90fd\u52a0 const<\/h4>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token keyword\">const<\/span> p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u65e2\u4e0d\u80fd\u4fee\u6539 p&#xff0c;\u4e5f\u4e0d\u80fd\u901a\u8fc7 p \u4fee\u6539 a\u3002<\/p>\n<table>\n<tr>\u58f0\u660e\u80fd\u5426\u6539\u53d8 p\u80fd\u5426\u901a\u8fc7 p \u4fee\u6539\u5bf9\u8c61<\/tr>\n<tbody>\n<tr>\n<td>const int *p<\/td>\n<td>\u53ef\u4ee5<\/td>\n<td>\u4e0d\u53ef\u4ee5<\/td>\n<\/tr>\n<tr>\n<td>int *const p<\/td>\n<td>\u4e0d\u53ef\u4ee5<\/td>\n<td>\u53ef\u4ee5&#xff0c;\u524d\u63d0\u662f\u5bf9\u8c61\u672c\u8eab\u53ef\u4fee\u6539<\/td>\n<\/tr>\n<tr>\n<td>const int *const p<\/td>\n<td>\u4e0d\u53ef\u4ee5<\/td>\n<td>\u4e0d\u53ef\u4ee5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>const int a \u4e0d\u80fd\u76f4\u63a5\u914d\u5408 int *const p &#061; &amp;a \u4f7f\u7528&#xff0c;\u56e0\u4e3a\u8fd9\u4f1a\u4e22\u5931\u6240\u6307\u5bf9\u8c61\u7684 const \u9650\u5b9a\u3002\u56fa\u5b9a\u6307\u9488\u81ea\u8eab&#xff0c;\u4e0d\u80fd\u5f25\u8865\u8fd9\u4e2a\u7c7b\u578b\u95ee\u9898\u3002\u5373\u4f7f\u901a\u8fc7\u5f3a\u5236\u8f6c\u6362\u53bb\u6389\u9650\u5b9a&#xff0c;\u4e5f\u4e0d\u80fd\u5408\u6cd5\u4fee\u6539\u539f\u672c\u5b9a\u4e49\u4e3a const \u7684\u5bf9\u8c61\u3002<\/p>\n<h3>\u4e03\u3001\u4e8c\u7ea7\u6307\u9488<\/h3>\n<p>\u4e8c\u7ea7\u6307\u9488\u662f\u6307\u5411\u6307\u9488\u7684\u6307\u9488\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>pp <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>p<span class=\"token punctuation\">;<\/span><\/p>\n<table>\n<tr>\u8868\u8fbe\u5f0f\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>pp<\/td>\n<td>\u4fdd\u5b58 p \u81ea\u8eab\u7684\u5730\u5740<\/td>\n<\/tr>\n<tr>\n<td>*pp<\/td>\n<td>\u6307\u4ee3\u6307\u9488\u53d8\u91cf p<\/td>\n<\/tr>\n<tr>\n<td>**pp<\/td>\n<td>\u6307\u4ee3 p \u6307\u5411\u7684\u6574\u6570\u5bf9\u8c61 a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e0b\u9762\u4e09\u79cd\u64cd\u4f5c\u5206\u522b\u4ece\u4e0a\u8ff0\u521d\u59cb\u72b6\u6001\u72ec\u7acb\u5f00\u59cb&#xff1a;<\/p>\n<p>pp <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4fee\u6539 pp<\/span><\/p>\n<p><span class=\"token operator\">*<\/span>pp <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4fee\u6539 p<\/span><\/p>\n<p><span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>pp <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4fee\u6539 a<\/span><\/p>\n<p>\u5224\u65ad\u4fee\u6539\u4e86\u8c01&#xff0c;\u5c31\u770b\u8d4b\u503c\u5de6\u8fb9\u6700\u7ec8\u6307\u4ee3\u54ea\u4e2a\u5bf9\u8c61\u3002<\/p>\n<p>\u6bcf\u4e00\u5c42\u90fd\u9700\u8981\u6ee1\u8db3\u5bf9\u5e94\u7684\u8bbf\u95ee\u6761\u4ef6\u3002pp \u6709\u6548&#xff0c;\u4e0d\u4ee3\u8868 *pp \u4fdd\u5b58\u7684\u6307\u9488\u4e5f\u4e00\u5b9a\u80fd\u7528\u4e8e\u8bbf\u95ee\u6574\u6570\u3002\u6539\u53d8\u6307\u9488\u7684\u503c\u4e0d\u4f1a\u6539\u53d8\u5b83\u7684\u58f0\u660e\u7c7b\u578b\u3002<\/p>\n<h3>\u516b\u3001\u6307\u9488\u4e0e\u6570\u7ec4<\/h3>\n<p>\u591a\u6570\u8868\u8fbe\u5f0f\u4e2d&#xff0c;\u6570\u7ec4\u4f1a\u8f6c\u6362\u4e3a\u6307\u5411\u9996\u5143\u7d20\u7684\u6307\u9488\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">40<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">50<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u7684 a \u8f6c\u6362\u4e3a\u6307\u5411 a[0] \u7684\u6307\u9488\u3002<\/p>\n<p>\u4f46\u662f&#xff0c;\u5728\u4e0b\u9762\u8fd9\u4e9b\u8868\u8fbe\u5f0f\u4e2d&#xff0c;\u4e0d\u53d1\u751f\u8fd9\u79cd\u8f6c\u6362&#xff1a;<\/p>\n<p><span class=\"token keyword\">sizeof<\/span> a<br \/>\n<span class=\"token operator\">&amp;<\/span>a<\/p>\n<ul>\n<li>sizeof a \u5f97\u5230\u6574\u4e2a\u6570\u7ec4\u5360\u7528\u7684\u5b57\u8282\u6570\u3002<\/li>\n<li>&amp;a \u53d6\u5f97\u6574\u4e2a\u6570\u7ec4\u7684\u5730\u5740\u3002<\/li>\n<\/ul>\n<p>\u6570\u7ec4\u672c\u8eab\u4e0d\u662f\u6307\u9488\u53d8\u91cf\u3002<\/p>\n<p><span class=\"token comment\">\/\/ a&#043;&#043;;   \/\/ \u4e0d\u5408\u6cd5<\/span><br \/>\n<span class=\"token comment\">\/\/ a &#061; p; \/\/ \u4e0d\u5408\u6cd5<\/span><\/p>\n<p>\u4e0d\u80fd\u7528\u201c\u6570\u7ec4\u540d\u5728\u5de6\u8fb9\u8fd8\u662f\u53f3\u8fb9\u201d\u5224\u65ad\u662f\u5426\u8f6c\u6362\u3002\u6570\u7ec4\u6709\u81ea\u5df1\u7684\u7c7b\u578b\u548c\u5b58\u50a8\u7a7a\u95f4&#xff0c;\u4e0d\u80fd\u901a\u8fc7\u666e\u901a\u8d4b\u503c\u6539\u53d8\u6307\u5411&#xff0c;\u4e5f\u4e0d\u80fd\u901a\u8fc7 a &#061; b \u6574\u4f53\u590d\u5236\u6570\u7ec4\u3002<\/p>\n<h4>\u6307\u5411\u9996\u5143\u7d20\u4e0e\u6307\u5411\u6574\u4e2a\u6570\u7ec4<\/h4>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>q<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>p \u6307\u5411\u9996\u5143\u7d20 a[0]\u3002<\/li>\n<li>q \u6307\u5411\u6574\u4e2a\u6570\u7ec4 a\u3002<\/li>\n<li>*q \u6307\u4ee3\u6574\u4e2a\u6570\u7ec4\u3002<\/li>\n<li>(*q)[2] \u5c31\u662f a[2]\u3002<\/li>\n<\/ul>\n<p>\u4e24\u8005\u6307\u5411\u7684\u5bf9\u8c61\u4ece\u540c\u4e00\u4e2a\u4f4d\u7f6e\u5f00\u59cb&#xff0c;\u4f46\u5bf9\u8c61\u8303\u56f4\u4e0e\u6307\u9488\u8fd0\u7b97\u6b65\u957f\u4e0d\u540c\u3002<\/p>\n<p>\u5047\u8bbe int \u5360 4 \u5b57\u8282&#xff1a;<\/p>\n<ul>\n<li>p &#043; 1 \u524d\u8fdb 4 \u5b57\u8282\u3002<\/li>\n<li>q &#043; 1 \u524d\u8fdb 20 \u5b57\u8282\u3002<\/li>\n<\/ul>\n<h4>\u6570\u7ec4\u4e0b\u6807\u4e0e\u6307\u9488\u8868\u8fbe\u5f0f<\/h4>\n<p>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><\/p>\n<p>\u6309 C \u8bed\u8a00\u7684\u5b9a\u4e49&#xff0c;\u7b49\u4ef7\u4e8e&#xff1a;<\/p>\n<p><span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&#043;<\/span> i<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u542b\u4e49\u662f&#xff1a;\u5148\u627e\u5230\u7b2c i \u4e2a\u4e0b\u6807\u5bf9\u5e94\u7684\u4f4d\u7f6e&#xff0c;\u518d\u8bbf\u95ee\u8be5\u5143\u7d20\u3002<\/p>\n<p>a<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u4e24\u53e5\u4fee\u6539\u7684\u662f\u540c\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n<h4>\u6570\u7ec4\u4f5c\u4e3a\u51fd\u6570\u53c2\u6570<\/h4>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5176\u4e2d\u7684\u6570\u7ec4\u5f62\u53c2\u4f1a\u8c03\u6574\u4e3a&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e0d\u4f1a\u81ea\u52a8\u4fdd\u7559\u6570\u7ec4\u957f\u5ea6&#xff0c;\u4e5f\u4e0d\u610f\u5473\u7740\u51fd\u6570\u63a5\u6536\u5230\u6574\u4e2a\u6570\u7ec4\u7684\u526f\u672c\u3002<\/p>\n<p>\u9700\u8981\u5143\u7d20\u4e2a\u6570\u65f6&#xff0c;\u901a\u5e38\u663e\u5f0f\u4f20\u5165&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u4e5d\u3001\u6307\u9488\u7684\u5e94\u7528&#xff1a;\u51fd\u6570\u4f20\u53c2<\/h3>\n<p>\u51fd\u6570\u4f20\u53c2\u53ef\u4ee5\u7406\u89e3\u4e3a&#xff1a;\u5efa\u7acb\u5f62\u53c2\u53d8\u91cf&#xff0c;\u5e76\u7528\u5b9e\u53c2\u7684\u503c\u521d\u59cb\u5316\u5b83&#xff1b;\u5fc5\u8981\u65f6\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u3002<\/p>\n<p>C \u7684\u51fd\u6570\u53c2\u6570\u90fd\u662f\u503c\u4f20\u9012&#xff0c;\u6307\u9488\u4e5f\u4e0d\u4f8b\u5916\u3002<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">change<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">change<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u51fd\u6570\u4e2d\u7684 p \u63a5\u6536\u7684\u662f q \u4fdd\u5b58\u7684\u5730\u5740\u7684\u526f\u672c\u3002<\/p>\n<ul>\n<li>*p &#061; 20 \u4fee\u6539\u539f\u5bf9\u8c61 a\u3002<\/li>\n<li>p &#061; NULL \u53ea\u4fee\u6539\u5f62\u53c2 p&#xff0c;\u4e0d\u4f1a\u4fee\u6539\u5916\u9762\u7684 q\u3002<\/li>\n<\/ul>\n<p>\u5730\u5740\u867d\u7136\u662f\u526f\u672c&#xff0c;\u4f46\u5b83\u4ecd\u7136\u6307\u5411\u539f\u5bf9\u8c61\u3002\u56e0\u6b64&#xff0c;\u201c\u53c2\u6570\u662f\u526f\u672c\u201d\u4e0e\u201c\u53ef\u4ee5\u4fee\u6539\u5916\u9762\u7684\u5bf9\u8c61\u201d\u5e76\u4e0d\u77db\u76fe\u3002<\/p>\n<p>\u4f20\u6307\u9488\u4e3b\u8981\u6709\u4e09\u79cd\u7528\u9014&#xff1a;<\/p>\n<li>\u4fee\u6539\u539f\u5bf9\u8c61\u3002<\/li>\n<li>\u901a\u8fc7\u8f93\u51fa\u53c2\u6570\u5199\u56de\u591a\u4e2a\u7ed3\u679c\u3002<\/li>\n<li>\u907f\u514d\u6309\u503c\u4f20\u9012\u8f83\u5927\u5bf9\u8c61\u3002<\/li>\n<p>\u5373\u4f7f\u53ea\u8bfb\u53d6\u5927\u5bf9\u8c61&#xff0c;\u4e5f\u53ef\u4ee5\u4f20\u6307\u9488&#xff0c;\u5e76\u7528 const \u9650\u5236\u4fee\u6539&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Data<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> values<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">read_data<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Data<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u5341\u3001\u52a8\u6001\u5185\u5b58\u7ba1\u7406<\/h3>\n<h4>1. \u6808\u3001\u5806\u4e0e\u751f\u547d\u5468\u671f<\/h4>\n<p>\u7a0b\u5e8f\u5185\u5b58\u5e38\u7528\u4ee3\u7801\u6bb5\u3001\u6570\u636e\u6bb5\u3001\u6808\u3001\u5806\u8fdb\u884c\u7b80\u5316\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u4ee3\u7801\u6bb5\u901a\u5e38\u5b58\u653e\u7a0b\u5e8f\u6307\u4ee4\u3002<\/li>\n<li>\u5177\u6709\u9759\u6001\u5b58\u50a8\u671f\u7684\u5bf9\u8c61\u901a\u5e38\u4f4d\u4e8e\u6570\u636e\u6bb5\u3001BSS \u6bb5\u7b49\u533a\u57df\u3002<\/li>\n<li>\u6808\u901a\u5e38\u4fdd\u5b58\u51fd\u6570\u8c03\u7528\u4fe1\u606f\u548c\u90e8\u5206\u5c40\u90e8\u53d8\u91cf\u3002<\/li>\n<li>\u5806\u901a\u5e38\u7528\u4e8e\u52a8\u6001\u5185\u5b58\u5206\u914d\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u662f\u5e38\u89c1\u7684\u5b9e\u73b0\u6a21\u578b&#xff0c;\u4f46\u4e0d\u662f C \u6807\u51c6\u8981\u6c42\u6240\u6709\u7a0b\u5e8f\u5fc5\u987b\u91c7\u7528\u7684\u56fa\u5b9a\u5e03\u5c40\u3002<\/p>\n<p>\u6808\u548c\u5806\u7684\u53ef\u7528\u7a7a\u95f4\u90fd\u6709\u9650\u3002<\/p>\n<p>\u666e\u901a\u81ea\u52a8\u5c40\u90e8\u53d8\u91cf\u901a\u5e38\u5728\u79bb\u5f00\u6240\u5c5e\u4ee3\u7801\u5757\u65f6\u7ed3\u675f\u751f\u547d\u5468\u671f&#xff0c;\u9759\u6001\u5c40\u90e8\u53d8\u91cf\u4f8b\u5916\u3002<\/p>\n<p>\u6808\u5e27\u662f\u4e00\u7ec4\u51fd\u6570\u8c03\u7528\u76f8\u5173\u7684\u6808\u4e0a\u4fe1\u606f&#xff0c;\u4e0d\u662f\u6bcf\u4e2a\u53d8\u91cf\u5404\u6709\u4e00\u4e2a\u6808\u5e27\u3002<\/p>\n<p>\u9012\u5f52\u8c03\u7528\u5c1a\u672a\u8fd4\u56de\u65f6&#xff0c;\u5148\u524d\u8c03\u7528\u6240\u9700\u7684\u4fe1\u606f\u4ecd\u8981\u4fdd\u7559&#xff0c;\u6301\u7eed\u7d2f\u79ef\u53ef\u80fd\u5bfc\u81f4\u6808\u6ea2\u51fa\u3002<\/p>\n<h4>2. \u6307\u9488\u53d8\u91cf\u4e0e\u52a8\u6001\u5185\u5b58\u7684\u751f\u547d\u5468\u671f\u4e0d\u540c<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u8981\u533a\u5206&#xff1a;<\/p>\n<ul>\n<li>\u6307\u9488\u53d8\u91cf p\u3002<\/li>\n<li>malloc \u7533\u8bf7\u7684\u52a8\u6001\u5185\u5b58\u3002<\/li>\n<\/ul>\n<p>\u5c40\u90e8\u6307\u9488\u53d8\u91cf\u7ed3\u675f\u751f\u547d\u5468\u671f&#xff0c;\u4e0d\u4f1a\u81ea\u52a8\u91ca\u653e\u5b83\u6307\u5411\u7684\u52a8\u6001\u5185\u5b58\u3002<\/p>\n<p>\u540c\u6837&#xff0c;\u52a8\u6001\u5185\u5b58\u88ab\u91ca\u653e\u540e&#xff0c;\u4e5f\u4e0d\u4f1a\u81ea\u52a8\u628a\u6240\u6709\u76f8\u5173\u6307\u9488\u8bbe\u4e3a NULL\u3002<\/p>\n<p>\u91ca\u653e\u8868\u793a\u8fd9\u5757\u5185\u5b58\u4e0d\u518d\u5c5e\u4e8e\u7a0b\u5e8f\u4e2d\u8fd9\u6b21\u5206\u914d\u6240\u5efa\u7acb\u7684\u5bf9\u8c61&#xff0c;\u4e0d\u80fd\u7ee7\u7eed\u8bbf\u95ee\u3002\u6ce8\u610f&#xff0c;\u91ca\u653e\u4e0d\u4fdd\u8bc1\u6e05\u96f6&#xff0c;\u4e5f\u4e0d\u80fd\u4f9d\u8d56\u539f\u6570\u636e\u4ecd\u7136\u4fdd\u7559\u3002<\/p>\n<h4>3. \u5185\u5b58\u6cc4\u6f0f<\/h4>\n<p>\u5185\u5b58\u6cc4\u6f0f\u7684\u672c\u8d28\u662f\u52a8\u6001\u7533\u8bf7\u7684\u5185\u5b58\u6ca1\u6709\u88ab\u6b63\u786e\u91ca\u653e\u3002<\/p>\n<p>\u5e38\u89c1\u60c5\u51b5\u5305\u62ec&#xff1a;<\/p>\n<ul>\n<li>\u5df2\u7ecf\u4e22\u5931\u6240\u6709\u8bbf\u95ee\u9014\u5f84&#xff0c;\u65e0\u6cd5\u6b63\u5e38\u91ca\u653e\u3002<\/li>\n<li>\u867d\u7136\u4ecd\u80fd\u627e\u5230&#xff0c;\u4f46\u5df2\u7ecf\u4e0d\u518d\u9700\u8981&#xff0c;\u56e0\u7a0b\u5e8f\u758f\u6f0f\u957f\u671f\u6ca1\u6709\u91ca\u653e\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\np <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5047\u8bbe\u7533\u8bf7\u6210\u529f&#xff0c;\u4e14\u6ca1\u6709\u5176\u4ed6\u6307\u9488\u4fdd\u5b58\u8fd9\u5757\u5185\u5b58\u7684\u5730\u5740&#xff0c;\u90a3\u4e48\u7b2c\u4e8c\u53e5\u4f1a\u4e22\u5931\u552f\u4e00\u7684\u8bbf\u95ee\u9014\u5f84\u3002<\/p>\n<p>\u628a\u6307\u9488\u8bbe\u4e3a NULL \u4e0d\u7b49\u4e8e\u91ca\u653e\u5185\u5b58\u3002<\/p>\n<p>\u4e0d\u80fd\u4ec5\u51ed\u5185\u5b58\u5360\u7528\u589e\u957f\u5224\u65ad\u6cc4\u6f0f\u3002\u4ecd\u7136\u9700\u8981\u7684\u6570\u636e\u53ef\u4ee5\u5408\u7406\u5360\u7528\u7a7a\u95f4&#xff1b;\u7533\u8bf7\u5931\u8d25\u4e5f\u53ef\u80fd\u53ea\u662f\u8d44\u6e90\u4e0d\u8db3\u3002<\/p>\n<h4>4. malloc\u51fd\u6570<\/h4>\n<p>malloc \u7533\u8bf7\u6307\u5b9a\u5b57\u8282\u6570\u7684\u7a7a\u95f4&#xff0c;\u6210\u529f\u8fd4\u56de\u6307\u5411\u6240\u5206\u914d\u7a7a\u95f4\u7684\u6307\u9488&#xff0c;\u5931\u8d25\u8fd4\u56de\u7a7a\u6307\u9488\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7533\u8bf7\u6210\u529f\u540e&#xff0c;\u8fd9\u91cc\u53ef\u4ee5\u5b58\u653e 5 \u4e2a int\u3002<\/p>\n<p>\u4f7f\u7528\u524d\u9700\u8981\u68c0\u67e5&#xff1a;<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5904\u7406\u7533\u8bf7\u5931\u8d25&#xff0c;\u4e0d\u80fd\u7ee7\u7eed\u901a\u8fc7 p \u8bbf\u95ee\u5143\u7d20<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>malloc \u4e0d\u8d1f\u8d23\u521d\u59cb\u5316\u6240\u5206\u914d\u7a7a\u95f4\u4e2d\u7684\u503c\u3002<\/p>\n<p>\u4e3a\u4e86\u8868\u8ff0\u4e25\u8c28&#xff0c;\u4e0d\u8981\u628a\u672a\u521d\u59cb\u5316\u7684\u5185\u5bb9\u8bf4\u6210\u201c\u4e00\u7ec4\u968f\u673a\u6570\u201d\u3002\u5b83\u4eec\u5177\u6709\u4e0d\u786e\u5b9a\u7684\u5185\u5bb9&#xff0c;\u4e0d\u80fd\u4f5c\u4e3a\u5df2\u7ecf\u521d\u59cb\u5316\u7684\u6709\u6548\u6570\u636e\u76f4\u63a5\u4f7f\u7528&#xff1b;\u67d0\u4e9b\u8bfb\u53d6\u4f1a\u4ea7\u751f\u672a\u5b9a\u4e49\u884c\u4e3a\u3002\u5e94\u5148\u5199\u5165\u6709\u6548\u503c&#xff0c;\u518d\u8bfb\u53d6\u3002<\/p>\n<h4>5. calloc\u51fd\u6570<\/h4>\n<p>calloc \u6309\u5143\u7d20\u4e2a\u6570\u548c\u6bcf\u4e2a\u5143\u7d20\u7684\u5b57\u8282\u6570\u7533\u8bf7\u7a7a\u95f4&#xff0c;\u5e76\u5c06\u5206\u914d\u7a7a\u95f4\u7684\u6240\u6709\u4f4d\u6e05\u96f6\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">calloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7533\u8bf7\u6210\u529f\u540e&#xff0c;\u5bf9\u4e8e\u8fd9\u91cc\u7684 int \u5143\u7d20&#xff0c;\u53ef\u4ee5\u76f4\u63a5\u8bfb\u53d6\u5230\u6574\u6570 0\u3002<\/p>\n<p>\u6240\u6709\u4f4d\u6e05\u96f6&#xff0c;\u4e0d\u7b49\u4e8e\u5bf9\u6240\u6709\u7c7b\u578b\u90fd\u8fdb\u884c\u4e86\u5bf9\u5e94\u7684\u8bed\u4e49\u521d\u59cb\u5316\u3002<\/p>\n<p>\u4f8b\u5982&#xff0c;\u82e5\u5206\u914d\u7684\u7a7a\u95f4\u7528\u4e8e\u5b58\u653e\u6307\u9488&#xff0c;\u4e0d\u80fd\u4ec5\u51ed\u6240\u6709\u4f4d\u4e3a\u96f6&#xff0c;\u5c31\u4fdd\u8bc1\u6bcf\u4e2a\u6307\u9488\u90fd\u662f\u7a7a\u6307\u9488\u3002<\/p>\n<p>\u66f4\u51c6\u786e\u5730\u8bf4&#xff1a;C \u4e0d\u8981\u6c42\u7a7a\u6307\u9488\u7684\u5e95\u5c42\u8868\u793a\u4e00\u5b9a\u662f\u5168\u96f6\u4f4d\u6a21\u5f0f\u3002p &#061; NULL \u662f\u6309\u8bed\u8a00\u89c4\u5219\u7ed9\u6307\u9488\u8d4b\u7a7a\u6307\u9488\u503c&#xff0c;\u4e0e\u76f4\u63a5\u628a\u5b58\u50a8\u7a7a\u95f4\u7684\u6bcf\u4e00\u4f4d\u6e05\u96f6\u4e0d\u662f\u540c\u4e00\u4ef6\u4e8b\u3002<\/p>\n<h4>6. realloc\u51fd\u6570<\/h4>\n<p>realloc \u8c03\u6574\u5df2\u5206\u914d\u7a7a\u95f4\u7684\u5927\u5c0f&#xff0c;\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u65b0\u7684\u603b\u5b57\u8282\u6570\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>tmp <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">realloc<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tmp <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    p <span class=\"token operator\">&#061;<\/span> tmp<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8c03\u6574\u5931\u8d25&#xff0c;p \u4ecd\u4fdd\u5b58\u539f\u5206\u914d\u5757\u7684\u5730\u5740<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u91cc\u5047\u8bbe p \u662f\u5f53\u524d\u6709\u6548\u5206\u914d\u5757\u7684\u9996\u5730\u5740\u3002<\/p>\n<p>\u6269\u5927\u548c\u7f29\u5c0f\u90fd\u53ef\u80fd\u539f\u5730\u5b8c\u6210&#xff0c;\u4e5f\u53ef\u80fd\u79fb\u52a8\u5230\u5176\u4ed6\u4f4d\u7f6e\u3002<\/p>\n<p>\u6210\u529f\u540e&#xff1a;<\/p>\n<ul>\n<li>\u4fdd\u7559\u65b0\u65e7\u5927\u5c0f\u4e2d\u8f83\u5c0f\u8303\u56f4\u5185\u7684\u539f\u6709\u5185\u5bb9\u3002<\/li>\n<li>\u6269\u5927\u540e\u65b0\u589e\u7684\u90e8\u5206\u672a\u521d\u59cb\u5316\u3002<\/li>\n<li>\u7f29\u5c0f\u540e\u820d\u5f03\u7684\u90e8\u5206\u4e0d\u80fd\u518d\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n<p>\u4e0d\u8981\u76f4\u63a5\u7528\u552f\u4e00\u4fdd\u5b58\u65e7\u5730\u5740\u7684\u6307\u9488\u63a5\u6536\u8fd4\u56de\u503c\u3002<\/p>\n<p>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">realloc<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5982\u679c\u5931\u8d25\u8fd4\u56de NULL&#xff0c;\u8fd9\u53e5\u4f1a\u8986\u76d6\u65e7\u5730\u5740&#xff0c;\u53ef\u80fd\u9020\u6210\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n<p>\u66f4\u51c6\u786e\u5730\u8bf4&#xff1a;\u8bf7\u6c42\u7684\u65b0\u5927\u5c0f\u5927\u4e8e\u96f6\u65f6&#xff0c;\u5931\u8d25\u8fd4\u56de\u7a7a\u6307\u9488&#xff0c;\u65e7\u5185\u5b58\u53ca\u5176\u5185\u5bb9\u4fdd\u7559\u3002\u6210\u529f\u540e\u5e94\u4f7f\u7528\u8fd4\u56de\u7684\u65b0\u6307\u9488&#xff1b;\u5373\u4f7f\u5730\u5740\u770b\u8d77\u6765\u6ca1\u53d8&#xff0c;\u4e5f\u4e0d\u5e94\u7ee7\u7eed\u4f7f\u7528\u8c03\u7528\u524d\u4fdd\u7559\u7684\u65e7\u6307\u9488\u6216\u5185\u90e8\u6307\u9488\u3002\u9700\u8981\u5185\u90e8\u6307\u9488\u65f6&#xff0c;\u5e94\u6839\u636e\u65b0\u6307\u9488\u91cd\u65b0\u8ba1\u7b97\u3002<\/p>\n<p>\u7f29\u5c0f\u540e\u518d\u6269\u5927&#xff0c;\u4e0d\u4fdd\u8bc1\u6062\u590d\u4e4b\u524d\u88ab\u820d\u5f03\u7684\u6570\u636e\u3002<\/p>\n<p>\u8fd9\u91cc\u8ba8\u8bba\u7684\u65b0\u5927\u5c0f\u5747\u5927\u4e8e\u96f6\u3002\u9700\u8981\u91ca\u653e\u6574\u5757\u7a7a\u95f4\u65f6&#xff0c;\u76f4\u63a5\u4f7f\u7528 free\u3002<\/p>\n<h4>7. free<\/h4>\n<p>free \u91ca\u653e\u52a8\u6001\u5185\u5b58\u5757\u3002<\/p>\n<p><span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\np <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e24\u53e5\u5206\u522b\u505a\u4e0d\u540c\u7684\u4e8b&#xff1a;<\/p>\n<ul>\n<li>free(p) \u91ca\u653e\u52a8\u6001\u5185\u5b58\u3002<\/li>\n<li>p &#061; NULL \u4fee\u6539\u6307\u9488\u53d8\u91cf&#xff0c;\u907f\u514d\u5b83\u7ee7\u7eed\u4fdd\u7559\u5931\u6548\u7684\u6307\u9488\u503c\u3002<\/li>\n<\/ul>\n<p>\u80fd\u5426 free&#xff0c;\u8981\u770b\u5b83\u662f\u4e0d\u662f\u5f53\u524d\u6709\u6548\u5206\u914d\u5757\u7684\u9996\u5730\u5740&#xff0c;\u800c\u4e0d\u662f\u54ea\u4e2a\u53d8\u91cf\u6700\u521d\u63a5\u6536\u4e86\u7533\u8bf7\u7ed3\u679c\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> p<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5047\u8bbe\u7533\u8bf7\u6210\u529f&#xff0c;\u901a\u8fc7 q \u91ca\u653e\u540c\u6837\u5408\u6cd5\u3002\u4f46\u91ca\u653e\u540e\u4e0d\u80fd\u518d\u901a\u8fc7 p \u6216 q \u8bbf\u95ee\u8fd9\u5757\u5185\u5b58&#xff0c;\u4e5f\u4e0d\u80fd\u518d\u6b21\u91ca\u653e\u5b83\u3002<\/p>\n<p><span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5408\u6cd5&#xff0c;\u4e0d\u6267\u884c\u91ca\u653e\u3002<\/p>\n<p>\u6307\u5411\u5206\u914d\u5757\u5185\u90e8\u975e\u9996\u4f4d\u7f6e\u7684\u6307\u9488\u4e0d\u80fd\u4f20\u7ed9 free&#xff1b;\u666e\u901a\u5c40\u90e8\u53d8\u91cf\u3001\u666e\u901a\u6570\u7ec4\u7b49\u5bf9\u8c61\u7684\u5730\u5740\u4e5f\u4e0d\u80fd\u4f20\u7ed9 free\u3002\u540c\u4e00\u5757\u5206\u914d\u7a7a\u95f4\u53ea\u80fd\u91ca\u653e\u4e00\u6b21\u3002<\/p>\n<h3>\u5341\u4e00\u3001\u51fd\u6570\u6307\u9488\u4e0e\u56de\u8c03<\/h3>\n<p>\u51fd\u6570\u6307\u9488\u53ef\u4ee5\u6307\u5411\u51fd\u6570&#xff0c;\u5e76\u901a\u8fc7\u5b83\u8c03\u7528\u51fd\u6570\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">sub<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> a <span class=\"token operator\">&#8211;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\u6307\u9488&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> add<span class=\"token punctuation\">;<\/span><\/p>\n<p>p \u6307\u5411\u201c\u63a5\u6536\u4e24\u4e2a int \u53c2\u6570\u3001\u8fd4\u56de int\u201d\u7684\u51fd\u6570\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">p<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7ed3\u679c\u4e3a 7<\/span><\/p>\n<p>\u4e5f\u53ef\u4ee5\u5199\u6210&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u56de\u8c03\u793a\u4f8b<\/h4>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">sub<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> a <span class=\"token operator\">&#8211;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">calculate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> y<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>op<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">op<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">calculate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> add<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 7<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">calculate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> sub<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ -1<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>calculate \u63a5\u6536\u51fd\u6570\u6307\u9488&#xff0c;\u901a\u8fc7 op \u8c03\u7528\u4f20\u5165\u7684\u51fd\u6570\u3002<\/p>\n<ul>\n<li>\u4f20\u5165 add&#xff0c;\u6267\u884c\u52a0\u6cd5\u3002<\/li>\n<li>\u4f20\u5165 sub&#xff0c;\u6267\u884c\u51cf\u6cd5\u3002<\/li>\n<\/ul>\n<p>\u628a\u51fd\u6570\u4ea4\u7ed9\u53e6\u4e00\u4e2a\u51fd\u6570&#xff0c;\u7531\u540e\u8005\u5728\u9700\u8981\u65f6\u8c03\u7528&#xff0c;\u662f\u56de\u8c03\u7684\u5178\u578b\u7528\u6cd5\u3002<\/p>\n<p>\u56de\u8c03\u4e0d\u4ec5\u8981\u6ee1\u8db3\u51fd\u6570\u7c7b\u578b\u8981\u6c42&#xff0c;\u8fd8\u8981\u9075\u5b88\u63a5\u53e3\u5bf9\u8fd4\u56de\u503c\u542b\u4e49\u7b49\u65b9\u9762\u7684\u7ea6\u5b9a\u3002\u6392\u5e8f\u6bd4\u8f83\u51fd\u6570\u5c31\u662f\u4e00\u4e2a\u5178\u578b\u4f8b\u5b50\u3002<\/p>\n<hr \/>\n<h3>\u5341\u4e8c\u3001\u8865\u5145\u95ee\u7b54<\/h3>\n<p>\u4e0b\u9762\u89e3\u91ca\u5e38\u89c1\u7684\u7591\u95ee\u4e0e\u6613\u6df7\u6dc6\u7684\u77e5\u8bc6\u3002<\/p>\n<h4>1. \u6307\u9488\u7c7b\u578b\u548c\u6307\u9488\u503c\u6709\u4ec0\u4e48\u533a\u522b&#xff1f;<\/h4>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p>p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>p \u7684\u7c7b\u578b\u59cb\u7ec8\u662f int *&#xff0c;\u8d4b\u503c\u53ea\u6539\u53d8\u5b83\u4fdd\u5b58\u7684\u503c\u3002<\/p>\n<p>\u628a\u6307\u9488\u8bbe\u4e3a\u7a7a\u6307\u9488&#xff0c;\u4e0d\u4f1a\u6539\u53d8\u5b83\u7684\u7c7b\u578b\u3002<\/p>\n<h4>2. p &#061; q \u4e0e *p &#061; *q \u5206\u522b\u6539\u53d8\u4ec0\u4e48&#xff1f;<\/h4>\n<p>\u5206\u522b\u4ece\u4e0b\u9762\u7684\u72b6\u6001\u72ec\u7acb\u5f00\u59cb&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>b<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6267\u884c&#xff1a;<\/p>\n<p>p <span class=\"token operator\">&#061;<\/span> q<span class=\"token punctuation\">;<\/span><\/p>\n<p>p \u6539\u4e3a\u6307\u5411 b&#xff0c;a \u548c b \u7684\u503c\u4e0d\u53d8\u3002<\/p>\n<p>\u6267\u884c&#xff1a;<\/p>\n<p><span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>q<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u628a b \u7684\u503c 20 \u8d4b\u7ed9 a&#xff0c;\u4e24\u4e2a\u6307\u9488\u7684\u6307\u5411\u4e0d\u53d8\u3002<\/p>\n<p>\u524d\u8005\u590d\u5236\u6307\u9488\u503c&#xff0c;\u540e\u8005\u590d\u5236\u6240\u6307\u5bf9\u8c61\u7684\u503c\u3002<\/p>\n<h4>3. \u51fd\u6570\u4f20\u53c2\u662f\u526f\u672c&#xff0c;\u4e3a\u4ec0\u4e48\u8fd8\u80fd\u4fee\u6539\u5916\u9762\u7684\u5bf9\u8c61&#xff1f;<\/h4>\n<p>\u56e0\u4e3a\u5730\u5740\u867d\u7136\u662f\u526f\u672c&#xff0c;\u4f46\u5b83\u4ecd\u7136\u6307\u5411\u539f\u5bf9\u8c61\u3002<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">change<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">change<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ a \u4e3a 20<\/span><br \/>\n    <span class=\"token comment\">\/\/ q \u4ecd\u7136\u6307\u5411 a<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>p \u4e0e q \u662f\u4e0d\u540c\u7684\u6307\u9488\u53d8\u91cf&#xff0c;\u4f46\u6700\u521d\u4fdd\u5b58\u76f8\u540c\u7684\u5730\u5740\u3002<\/p>\n<h4>4. \u5982\u679c\u60f3\u4fee\u6539\u5916\u9762\u7684\u6307\u9488\u53d8\u91cf\u5462&#xff1f;<\/h4>\n<p>\u628a\u6307\u9488\u53d8\u91cf\u81ea\u8eab\u7684\u5730\u5740\u4f20\u8fdb\u53bb\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stddef.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">clear_pointer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>pp<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token operator\">*<\/span>pp <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">clear_pointer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>q<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ q \u5df2\u7ecf\u53d8\u6210\u7a7a\u6307\u9488<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>pp \u4fdd\u5b58 q \u7684\u5730\u5740&#xff0c;\u56e0\u6b64 *pp \u6307\u4ee3\u5916\u9762\u7684 q\u3002<\/p>\n<p>\u5982\u679c\u5199\u6210&#xff1a;<\/p>\n<p>pp <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u624d\u53ea\u662f\u4fee\u6539\u5c40\u90e8\u5f62\u53c2\u3002<\/p>\n<h4>5. \u4e24\u7ea7\u89e3\u5f15\u7528\u4e2d&#xff0c;\u64cd\u4f5c\u987a\u5e8f\u4e3a\u4ec0\u4e48\u91cd\u8981&#xff1f;<\/h4>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>pp <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>q<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token operator\">*<\/span>pp <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>pp <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u9519\u8bef<\/span><\/p>\n<p>\u7b2c\u4e00\u53e5\u4f7f q \u53d8\u4e3a\u7a7a\u6307\u9488\u3002<\/p>\n<p>\u7b2c\u4e8c\u53e5\u76f8\u5f53\u4e8e&#xff1a;<\/p>\n<p><span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u901a\u8fc7\u7a7a\u6307\u9488\u5199\u5165&#xff0c;\u884c\u4e3a\u672a\u5b9a\u4e49\u3002<\/p>\n<p>pp \u4ecd\u7136\u6307\u5411\u6709\u6548\u7684\u6307\u9488\u53d8\u91cf q&#xff0c;\u4f46 q \u5df2\u7ecf\u4e0d\u518d\u6307\u5411\u6574\u6570\u5bf9\u8c61\u3002<\/p>\n<h4>6. \u53ea\u8bfb\u53d6\u5927\u5bf9\u8c61&#xff0c;\u4e5f\u503c\u5f97\u4f20\u6307\u9488\u5417&#xff1f;<\/h4>\n<p>\u503c\u5f97&#xff0c;\u56e0\u4e3a\u53ef\u4ee5\u907f\u514d\u5728\u8bed\u8a00\u8bed\u4e49\u4e0a\u6309\u503c\u590d\u5236\u6574\u4e2a\u5bf9\u8c61\u3002<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Data<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> values<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">f<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Data<\/span> x<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">g<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Data<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>f \u63a5\u6536\u7ed3\u6784\u4f53\u526f\u672c\u3002<\/li>\n<li>g \u63a5\u6536\u7ed3\u6784\u4f53\u5730\u5740&#xff0c;\u901a\u8fc7\u5b83\u8bfb\u53d6\u539f\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<p>\u4e24\u79cd\u65b9\u5f0f\u90fd\u80fd\u8bfb\u53d6\u6210\u5458&#xff0c;\u4f46\u4f20\u6307\u9488\u53ef\u4ee5\u8868\u8fbe\u201c\u8bbf\u95ee\u73b0\u6709\u5bf9\u8c61\u201d\u7684\u610f\u56fe\u3002<\/p>\n<p>\u5b9e\u9645\u673a\u5668\u4ee3\u7801\u8fd8\u53ef\u80fd\u7ecf\u8fc7\u4f18\u5316&#xff0c;\u4e0d\u80fd\u4ec5\u6839\u636e\u6e90\u4ee3\u7801\u5c31\u65ad\u8a00\u5177\u4f53\u53d1\u751f\u4e86\u591a\u5c11\u6b21\u5185\u5b58\u590d\u5236\u3002<\/p>\n<h4>7. \u6307\u9488\u600e\u4e48\u8ba9\u51fd\u6570\u63d0\u4f9b\u591a\u4e2a\u7ed3\u679c&#xff1f;<\/h4>\n<p>\u901a\u8fc7\u8f93\u51fa\u53c2\u6570\u5199\u56de\u7ed3\u679c\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stddef.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">minmax<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> n<span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>min_out<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>max_out<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7ea6\u5b9a&#xff1a;n &gt; 0&#xff0c;a \u6307\u5411\u81f3\u5c11 n \u4e2a\u6709\u6548 int&#xff0c;<\/span><br \/>\n    <span class=\"token comment\">\/\/ min_out \u548c max_out \u6307\u5411\u4e24\u4e2a\u4e0d\u540c\u7684\u53ef\u5199 int \u5bf9\u8c61<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> low <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> high <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">size_t<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;<\/span> low<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            low <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&gt;<\/span> high<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            high <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token operator\">*<\/span>min_out <span class=\"token operator\">&#061;<\/span> low<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">*<\/span>max_out <span class=\"token operator\">&#061;<\/span> high<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">28<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> low<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> high<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">minmax<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>low<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>high<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8c03\u7528\u540e&#xff1a;<\/p>\n<ul>\n<li>low \u4e3a 3\u3002<\/li>\n<li>high \u4e3a 28\u3002<\/li>\n<\/ul>\n<p>\u8f93\u5165\u6570\u7ec4\u52a0 const&#xff0c;\u8868\u793a\u51fd\u6570\u4e0d\u901a\u8fc7\u8be5\u6307\u9488\u4fee\u6539\u6570\u7ec4&#xff1b;\u8f93\u51fa\u5bf9\u8c61\u5219\u5fc5\u987b\u5141\u8bb8\u5199\u5165\u3002<\/p>\n<h4>8. void * \u63a5\u6536 int \u7684\u5730\u5740&#xff0c;\u4f1a\u81ea\u52a8\u53d8\u6210 int * \u5417&#xff1f;<\/h4>\n<p>\u4e0d\u4f1a\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> p<span class=\"token punctuation\">;<\/span><\/p>\n<p>p \u4ecd\u7136\u662f void *&#xff0c;q \u624d\u662f int *\u3002<\/p>\n<p>\u8d4b\u503c\u53ef\u4ee5\u53d1\u751f\u7c7b\u578b\u8f6c\u6362&#xff0c;\u4f46\u4e0d\u4f1a\u6539\u53d8\u63a5\u6536\u53d8\u91cf\u5df2\u7ecf\u58f0\u660e\u7684\u7c7b\u578b\u3002<\/p>\n<h4>9. \u4e3a\u4ec0\u4e48\u4e0d\u80fd\u628a int \u7684\u5730\u5740\u8f6c\u6210 double *&#xff0c;\u518d\u8bfb\u51fa 10.0&#xff1f;<\/h4>\n<p>\u56e0\u4e3a\u6307\u9488\u8f6c\u6362\u4e0d\u4f1a\u8f6c\u6362\u6240\u6307\u6570\u636e&#xff0c;\u4e5f\u4e0d\u4f1a\u521b\u5efa double \u5bf9\u8c61\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4e0d\u80fd\u9760\u628a &amp;a \u8f6c\u6362\u4e3a double *&#xff0c;\u518d\u89e3\u5f15\u7528\u6765\u5f97\u5230 10.0<\/span><\/p>\n<p>\u771f\u6b63\u7684\u6570\u503c\u8f6c\u6362\u662f&#xff1a;<\/p>\n<p><span class=\"token keyword\">double<\/span> d <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span><span class=\"token punctuation\">)<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u628a\u6574\u6570\u503c 10 \u8f6c\u6362\u4e3a double \u503c 10.0&#xff0c;\u5e76\u5b58\u5165\u65b0\u7684\u5bf9\u8c61 d\u3002<\/p>\n<p>\u540c\u6837&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> x <span class=\"token operator\">&#061;<\/span> c<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u662f\u628a\u6574\u6570\u503c 10 \u8f6c\u6362\u4e3a int&#xff0c;\u4e0d\u662f\u201c\u8f6c\u6210 ASCII \u7801\u201d\u3002<\/p>\n<h4>10. void * \u4e3a\u4ec0\u4e48\u4e0d\u80fd\u76f4\u63a5\u52a0\u4e00&#xff1f;\u5b83\u6709\u4ec0\u4e48\u7528&#xff1f;<\/h4>\n<p>\u6307\u9488\u52a0\u4e00\u9700\u8981\u6839\u636e\u6240\u6307\u7c7b\u578b\u786e\u5b9a\u6b65\u957f&#xff0c;\u800c void \u6ca1\u6709\u53ef\u7528\u4e8e\u8fd9\u79cd\u8fd0\u7b97\u7684\u5bf9\u8c61\u5927\u5c0f\u3002<\/p>\n<p>\u56e0\u6b64\u6807\u51c6 C \u4e0d\u5141\u8bb8&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ p&#043;&#043;; \/\/ \u4e0d\u5408\u6cd5<\/span><\/p>\n<p>void * \u7684\u4ef7\u503c\u5728\u4e8e\u8ba9\u63a5\u53e3\u63a5\u6536\u6216\u8fd4\u56de\u4e0d\u540c\u7c7b\u578b\u5bf9\u8c61\u7684\u5730\u5740\u3002<\/p>\n<p>\u4f8b\u5982&#xff0c;malloc \u63a5\u6536\u7684\u662f\u5b57\u8282\u6570&#xff0c;\u4e0d\u9700\u8981\u77e5\u9053\u8c03\u7528\u8005\u6253\u7b97\u5b58\u653e int \u8fd8\u662f double\u3002<\/p>\n<h4>11. \u6307\u9488\u4e0a\u7684 const \u4f1a\u628a\u539f\u5bf9\u8c61\u53d8\u6210\u5e38\u91cf\u5417&#xff1f;<\/h4>\n<p>\u4e0d\u4f1a\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p>a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5408\u6cd5<\/span><\/p>\n<p>\u4e0d\u80fd\u901a\u8fc7 p \u4fee\u6539 a&#xff0c;\u4f46 a \u672c\u8eab\u4ecd\u7136\u662f\u53ef\u4fee\u6539\u7684\u666e\u901a\u53d8\u91cf\u3002<\/p>\n<p>\u5bf9\u6bd4&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u624d\u662f\u628a a \u5b9a\u4e49\u4e3a const \u5bf9\u8c61&#xff0c;\u4e0d\u80fd\u901a\u8fc7\u5f3a\u5236\u8f6c\u6362\u540e\u7684\u6307\u9488\u5408\u6cd5\u4fee\u6539\u5b83\u3002<\/p>\n<h4>12. \u6307\u5411\u6570\u7ec4\u7684\u6307\u9488\u4e0e\u6307\u9488\u6570\u7ec4\u6709\u4ec0\u4e48\u533a\u522b&#xff1f;<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<table>\n<tr>\u58f0\u660e\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>int (*p)[3]<\/td>\n<td>p \u662f\u6307\u9488&#xff0c;\u6307\u5411\u542b 3 \u4e2a int \u7684\u6570\u7ec4<\/td>\n<\/tr>\n<tr>\n<td>int *q[3]<\/td>\n<td>q \u662f\u6570\u7ec4&#xff0c;\u5305\u542b 3 \u4e2a int * \u5143\u7d20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e00\u4e2a\u662f\u201c\u6307\u9488&#xff0c;\u6307\u5411\u6570\u7ec4\u201d&#xff0c;\u53e6\u4e00\u4e2a\u662f\u201c\u6570\u7ec4&#xff0c;\u91cc\u9762\u653e\u6307\u9488\u201d\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> x <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> y <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> z <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token operator\">&amp;<\/span>x<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>y<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>z<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>(*p)[1] \u662f a[1]&#xff0c;\u503c\u4e3a 20\u3002<\/li>\n<li>*q[1] \u662f y&#xff0c;\u503c\u4e3a 2\u3002<\/li>\n<\/ul>\n<h4>13. \u6570\u7ec4\u5b57\u8282\u6570\u4e0e\u5143\u7d20\u4e2a\u6570\u600e\u4e48\u6c42&#xff1f;<\/h4>\n<p>\u5728\u6570\u7ec4\u7c7b\u578b\u5b8c\u6574\u3001\u8868\u8fbe\u5f0f\u4ecd\u7136\u8868\u793a\u6570\u7ec4\u7684\u5730\u65b9&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">sizeof<\/span> a               <span class=\"token comment\">\/\/ \u6574\u4e2a\u6570\u7ec4\u7684\u5b57\u8282\u6570<\/span><br \/>\n<span class=\"token keyword\">sizeof<\/span> a <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">sizeof<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token comment\">\/\/ \u5143\u7d20\u4e2a\u6570<\/span><\/p>\n<p>\u5982\u679c p \u662f\u6307\u9488&#xff1a;<\/p>\n<p><span class=\"token keyword\">sizeof<\/span> p <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">sizeof<\/span> p<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>\u5f97\u5230\u7684\u53ea\u662f\u201c\u6307\u9488\u5927\u5c0f\u9664\u4ee5\u5143\u7d20\u5927\u5c0f\u201d&#xff0c;\u4e0d\u80fd\u7528\u4e8e\u6c42\u5b83\u6240\u6307\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n<h4>14. \u51fd\u6570\u9700\u8981\u6570\u7ec4\u5927\u5c0f\u65f6\u600e\u4e48\u529e&#xff1f;<\/h4>\n<p>\u901a\u5e38\u7531\u8c03\u7528\u8005\u4f20\u5165&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span> a <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">sizeof<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u82e5\u63a5\u53e3\u660e\u786e\u63a5\u6536\u542b 5 \u4e2a int \u7684\u6570\u7ec4&#xff0c;\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6570\u7ec4\u6307\u9488&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">test_array<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%zu\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token function\">test_array<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc&#xff1a;<\/p>\n<ul>\n<li>sizeof *p \u662f\u6574\u4e2a\u6570\u7ec4\u7684\u5927\u5c0f\u3002<\/li>\n<li>sizeof p \u4ecd\u7136\u662f\u6307\u9488\u672c\u8eab\u7684\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<h4>15. \u6307\u9488\u81ea\u589e\u4e0e\u6240\u6307\u6570\u636e\u81ea\u589e\u600e\u4e48\u533a\u5206&#xff1f;<\/h4>\n<p>\u6bcf\u4e00\u884c\u90fd\u4ece\u4e0b\u9762\u7684\u72b6\u6001\u72ec\u7acb\u5f00\u59cb&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><\/p>\n<table>\n<tr>\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u53d6\u503c\u8868\u8fbe\u5f0f\u4f7f\u7528\u65f6\u7684\u7ed3\u679c\u6539\u53d8\u4e86\u4ec0\u4e48<\/tr>\n<tbody>\n<tr>\n<td>*p&#043;&#043;&#xff0c;\u5373 *(p&#043;&#043;)<\/td>\n<td align=\"right\">10<\/td>\n<td>p \u6307\u5411\u7b2c\u4e8c\u4e2a\u5143\u7d20<\/td>\n<\/tr>\n<tr>\n<td>(*p)&#043;&#043;<\/td>\n<td align=\"right\">10<\/td>\n<td>\u7b2c\u4e00\u4e2a\u5143\u7d20\u53d8\u6210 11<\/td>\n<\/tr>\n<tr>\n<td>&#043;&#043;(*p)<\/td>\n<td align=\"right\">11<\/td>\n<td>\u7b2c\u4e00\u4e2a\u5143\u7d20\u53d8\u6210 11<\/td>\n<\/tr>\n<tr>\n<td>*&#043;&#043;p&#xff0c;\u5373 *(&#043;&#043;p)<\/td>\n<td align=\"right\">20<\/td>\n<td>p \u6307\u5411\u7b2c\u4e8c\u4e2a\u5143\u7d20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u540e\u7f00\u81ea\u589e\u63d0\u4f9b\u65e7\u503c&#xff0c;\u4e0d\u4ee3\u8868\u5bf9\u8c61\u6ca1\u6709\u6539\u53d8\u3002<\/p>\n<p><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5373\u4f7f\u5355\u72ec\u5199\u6210\u4e00\u53e5&#xff0c;\u7b2c\u4e00\u4e2a\u5143\u7d20\u540c\u6837\u4f1a\u81ea\u589e&#xff0c;\u53ea\u662f\u8868\u8fbe\u5f0f\u63d0\u4f9b\u7684\u65e7\u503c\u6ca1\u6709\u88ab\u4f7f\u7528\u3002<\/p>\n<h4>16. \u6307\u9488\u76f8\u51cf\u5f97\u5230\u7684\u662f\u5b57\u8282\u6570\u5417&#xff1f;<\/h4>\n<p>\u4e0d\u662f&#xff0c;\u5f97\u5230\u7684\u662f\u5143\u7d20\u8ddd\u79bb\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>q <span class=\"token operator\">&#8211;<\/span> p <span class=\"token comment\">\/\/ 2<\/span><\/p>\n<p>\u5373\u4f7f int \u5360 4 \u5b57\u8282&#xff0c;\u7ed3\u679c\u4e5f\u662f 2&#xff0c;\u4e0d\u662f 8\u3002<\/p>\n<p>\u4e24\u4e2a\u6307\u9488\u5fc5\u987b\u6307\u5411\u540c\u4e00\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u6216\u5c3e\u540e\u4f4d\u7f6e&#xff0c;\u4e14\u5dee\u503c\u80fd\u7531 ptrdiff_t \u8868\u793a\u3002\u4e0d\u540c\u6570\u7ec4\u7684\u6307\u9488\u4e0d\u80fd\u4ec5\u51ed\u7c7b\u578b\u76f8\u540c\u5c31\u76f8\u51cf\u3002<\/p>\n<h4>17. \u5c3e\u540e\u6307\u9488\u80fd\u8bfb\u53d6\u5417&#xff1f;<\/h4>\n<p>\u4e0d\u80fd&#xff0c;\u4f46\u53ef\u4ee5\u4f5c\u4e3a\u8fb9\u754c\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> p<span class=\"token punctuation\">;<\/span> q <span class=\"token operator\">!&#061;<\/span> p <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span> q<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6700\u540e\u4e00\u6b21\u5199\u5165\u53d1\u751f\u5728 p &#043; 4&#xff0c;\u5230\u8fbe p &#043; 5 \u65f6\u505c\u6b62\u3002<\/p>\n<p>p &#043; 5 \u662f\u5c3e\u540e\u6307\u9488&#xff0c;\u4e0d\u6307\u5411\u6570\u7ec4\u4e2d\u7684\u6709\u6548\u5143\u7d20\u3002<\/p>\n<p>\u80fd\u5408\u6cd5\u5f62\u6210\u4e00\u4e2a\u6307\u9488&#xff0c;\u4e0d\u4ee3\u8868\u80fd\u901a\u8fc7\u5b83\u8bbf\u95ee\u5bf9\u8c61\u3002<\/p>\n<h4>18. \u52a8\u6001\u5185\u5b58\u8fd8\u5728&#xff0c;\u4e3a\u4ec0\u4e48\u4f1a\u627e\u4e0d\u5230&#xff1f;<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\np <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5047\u8bbe\u7533\u8bf7\u6210\u529f&#xff0c;\u53c8\u6ca1\u6709\u5176\u4ed6\u5730\u5740\u526f\u672c&#xff0c;\u90a3\u4e48\u8d4b\u503c\u4f1a\u4e22\u5931\u552f\u4e00\u7684\u8bbf\u95ee\u9014\u5f84&#xff0c;\u4f46\u6ca1\u6709\u91ca\u653e\u5185\u5b58\u3002<\/p>\n<p>\u5982\u679c\u5148\u4fdd\u5b58\u526f\u672c&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> p<span class=\"token punctuation\">;<\/span><\/p>\n<p>p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4ecd\u7136\u53ef\u4ee5\u901a\u8fc7 q \u91ca\u653e\u3002<\/p>\n<p>\u590d\u5236\u5730\u5740\u4e0d\u4f1a\u53e6\u5916\u7533\u8bf7\u4e00\u5757\u5185\u5b58\u3002<\/p>\n<h4>19. realloc \u5931\u8d25\u548c\u6210\u529f\u5206\u522b\u600e\u6837\u5904\u7406&#xff1f;<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>tmp <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">realloc<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>tmp <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    p <span class=\"token operator\">&#061;<\/span> tmp<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8c03\u6574\u5931\u8d25\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u91cc\u7684\u65b0\u5927\u5c0f\u5927\u4e8e\u96f6&#xff1a;<\/p>\n<ul>\n<li>\u5931\u8d25&#xff1a;\u65e7\u7a7a\u95f4\u53ca\u5176\u5185\u5bb9\u4fdd\u7559&#xff0c;\u7ee7\u7eed\u7531\u539f\u6765\u7684 p \u7ba1\u7406\u3002<\/li>\n<li>\u6210\u529f&#xff1a;\u4f7f\u7528\u8fd4\u56de\u503c\u66f4\u65b0 p&#xff0c;\u4e4b\u540e\u901a\u8fc7\u66f4\u65b0\u540e\u7684\u6307\u9488\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n<p>\u6210\u529f\u540e&#xff0c;\u65e7\u5206\u914d\u5df2\u7ecf\u7531 realloc \u5904\u7406&#xff0c;\u4e0d\u80fd\u518d\u6b21\u91ca\u653e\u65e7\u5730\u5740\u3002<\/p>\n<p>\u5373\u4f7f\u6ca1\u6709\u642c\u5230\u4e0d\u540c\u7684\u5730\u5740&#xff0c;\u4e5f\u5e94\u4f7f\u7528\u8fd4\u56de\u7684\u6307\u9488&#xff0c;\u4e0d\u80fd\u7ee7\u7eed\u4f9d\u8d56\u8c03\u7528\u524d\u4fdd\u5b58\u7684\u65e7\u6307\u9488\u3002<\/p>\n<h4>20. malloc \u548c calloc \u5f97\u5230\u7684\u7a7a\u95f4\u80fd\u76f4\u63a5\u8bfb\u53d6\u5417&#xff1f;<\/h4>\n<p>\u5bf9\u4e8e\u7528\u4e8e\u5b58\u653e int \u7684\u7a7a\u95f4&#xff1a;<\/p>\n<ul>\n<li>malloc \u672a\u521d\u59cb\u5316&#xff0c;\u5e94\u5148\u8d4b\u503c\u518d\u8bfb\u53d6\u3002<\/li>\n<li>calloc \u5c06\u6240\u6709\u4f4d\u6e05\u96f6&#xff0c;\u7533\u8bf7\u6210\u529f\u540e\u5404\u5143\u7d20\u7684\u6574\u6570\u503c\u4e3a 0\u3002<\/li>\n<\/ul>\n<p>\u4e0b\u9762\u8fd9\u53e5&#xff1a;<\/p>\n<p><span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53ea\u4fee\u6539\u7b2c\u4e00\u4e2a\u5143\u7d20&#xff0c;\u4e0d\u4f1a\u521d\u59cb\u5316\u6574\u5757\u7a7a\u95f4\u3002<\/p>\n<p>\u5982\u679c\u4f7f\u7528 malloc \u540e\u8981\u521d\u59cb\u5316 5 \u4e2a\u5143\u7d20&#xff1a;<\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">size_t<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    p<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4ee5\u4e0a\u64cd\u4f5c\u90fd\u4ee5\u7533\u8bf7\u6210\u529f\u4e3a\u524d\u63d0\u3002<\/p>\n<h4>21. sizeof *p \u4e3a\u4ec0\u4e48\u4e0d\u9700\u8981\u5148\u521d\u59cb\u5316 p&#xff1f;<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc sizeof \u6839\u636e *p \u7684\u7c7b\u578b\u8ba1\u7b97\u5927\u5c0f&#xff0c;\u4e0d\u5b9e\u9645\u6c42\u503c *p&#xff0c;\u56e0\u6b64\u4e0d\u4f1a\u8bfb\u53d6 p&#xff0c;\u4e5f\u4e0d\u4f1a\u8bbf\u95ee\u5b83\u6307\u5411\u7684\u5185\u5b58\u3002<\/p>\n<p>\u7ed3\u679c\u7b49\u4e8e&#xff1a;<\/p>\n<p><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u5bf9\u6bd4&#xff1a;<\/p>\n<p><span class=\"token keyword\">sizeof<\/span> p  <span class=\"token comment\">\/\/ \u6307\u9488\u672c\u8eab\u7684\u5927\u5c0f<\/span><br \/>\n<span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token comment\">\/\/ \u6240\u6307 int \u7c7b\u578b\u7684\u5927\u5c0f<\/span><\/p>\n<p>\u8fd9\u91cc\u4e0d\u6d89\u53ca\u53d8\u957f\u6570\u7ec4\u7c7b\u578b\u7684\u7279\u6b8a\u89c4\u5219&#xff0c;\u4e0d\u80fd\u628a\u201csizeof \u4e0d\u6c42\u503c\u201d\u4e0d\u52a0\u6761\u4ef6\u5730\u63a8\u5e7f\u5230\u6240\u6709\u60c5\u51b5\u3002<\/p>\n<h4>22. \u51fd\u6570\u8fd4\u56de\u7684\u5730\u5740\u4ec0\u4e48\u65f6\u5019\u4ecd\u7136\u6709\u6548&#xff1f;\u3010\u91cd\u70b9\u3011<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> n<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> target<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">size_t<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> target<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u91cc\u8fd4\u56de\u7684\u662f\u8c03\u7528\u8005\u6570\u7ec4\u4e2d\u67d0\u4e2a\u5143\u7d20\u7684\u5730\u5740\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6267\u884c\u540e&#xff0c;\u6570\u7ec4\u53d8\u6210&#xff1a;<\/p>\n<p><span class=\"token punctuation\">{<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p>find \u7ed3\u675f\u540e&#xff0c;\u5f62\u53c2\u6307\u9488\u7ed3\u675f\u751f\u547d\u5468\u671f&#xff0c;\u4f46\u8c03\u7528\u8005\u7684\u6570\u7ec4\u4ecd\u7136\u5b58\u5728&#xff0c;\u6240\u4ee5\u4ecd\u53ef\u901a\u8fc7\u8fd4\u56de\u7684\u6307\u9488\u8bbf\u95ee\u5bf9\u5e94\u5143\u7d20\u3002<\/p>\n<p>\u5bf9\u6bd4&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">bad<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> x <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&amp;<\/span>x<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u9519\u8bef\u7528\u6cd5<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>x \u5728\u51fd\u6570\u8fd4\u56de\u540e\u7ed3\u675f\u751f\u547d\u5468\u671f&#xff0c;\u4e0d\u80fd\u518d\u901a\u8fc7\u8fd4\u56de\u7684\u6307\u9488\u8bbf\u95ee\u5b83\u3002<\/p>\n<p>\u5173\u952e\u770b\u6240\u6307\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f&#xff0c;\u800c\u4e0d\u662f\u8fd4\u56de\u8fd9\u4e2a\u6307\u9488\u7684\u51fd\u6570\u662f\u5426\u5df2\u7ecf\u7ed3\u675f\u3002<\/p>\n<p>\u66f4\u51c6\u786e\u5730\u8bf4&#xff1a;\u5bf9\u8c61\u4ecd\u5b58\u5728\u53ea\u662f\u5fc5\u8981\u6761\u4ef6&#xff0c;\u8fd8\u8981\u6ee1\u8db3\u975e\u7a7a\u3001\u8fb9\u754c\u3001\u7c7b\u578b\u3001\u521d\u59cb\u5316\u7b49\u8bbf\u95ee\u8981\u6c42\u3002\u8fd4\u56de\u6216\u590d\u5236\u5730\u5740&#xff0c;\u4e0d\u4f1a\u5ef6\u957f\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\u3002<\/p>\n<h4>23. \u67e5\u627e\u51fd\u6570\u8fd4\u56de\u7684\u6307\u9488\u80fd free \u5417&#xff1f;\u3010\u91cd\u70b9\u3011<\/h4>\n<p>\u5982\u679c\u641c\u7d22\u7684\u662f\u666e\u901a\u5c40\u90e8\u6570\u7ec4&#xff0c;\u4e0d\u80fd\u91ca\u653e\u8fd4\u56de\u7684\u5143\u7d20\u5730\u5740\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ free(p); \/\/ \u4e0d\u5408\u6cd5<\/span><\/p>\n<p>\u5982\u679c\u641c\u7d22\u7684\u662f\u52a8\u6001\u6570\u7ec4&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>a <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token operator\">*<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4ee5\u4e0b\u5047\u8bbe\u7533\u8bf7\u6210\u529f<\/span><\/p>\n<p>a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\na<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\na<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">find<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>p \u6307\u5411\u7b2c\u4e8c\u4e2a\u5143\u7d20&#xff0c;\u662f\u5206\u914d\u5757\u5185\u90e8\u5730\u5740&#xff0c;\u4e0d\u80fd\u4f20\u7ed9 free\u3002<\/p>\n<p>\u5e94\u4f7f\u7528\u9996\u5730\u5740\u91ca\u653e&#xff1a;<\/p>\n<p><span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4fdd\u5b58\u76f8\u540c\u9996\u5730\u5740\u7684\u5176\u4ed6\u6307\u9488&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>q<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4ee5\u4e0a\u4e24\u79cd\u91ca\u653e\u65b9\u5f0f\u53ea\u80fd\u9009\u62e9\u4e00\u79cd&#xff0c;\u4e0d\u80fd\u8fde\u7eed\u6267\u884c\u3002<\/p>\n<p>\u5224\u65ad\u4f9d\u636e\u662f\u6709\u6548\u5206\u914d\u5757\u7684\u9996\u5730\u5740&#xff0c;\u4e0d\u662f\u53d8\u91cf\u540d&#xff0c;\u4e5f\u4e0d\u662f\u8c01\u6700\u521d\u63a5\u6536\u7533\u8bf7\u7ed3\u679c\u3002<\/p>\n<p>\u5982\u679c\u67e5\u627e\u5230\u7684\u6070\u597d\u662f\u52a8\u6001\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20&#xff0c;\u8fd4\u56de\u7684\u6307\u9488\u786e\u5b9e\u4fdd\u5b58\u5206\u914d\u5757\u9996\u5730\u5740&#xff1b;\u4f46\u5b9e\u9645\u662f\u5426\u5e94\u7531\u8c03\u7528\u8005\u5728\u8fd9\u91cc\u91ca\u653e&#xff0c;\u8fd8\u8981\u9075\u5b88\u7a0b\u5e8f\u5bf9\u8fd9\u5757\u5185\u5b58\u7684\u7ba1\u7406\u7ea6\u5b9a\u3002<\/p>\n<h4>24. \u91ca\u653e\u5185\u5b58\u4f1a\u5f71\u54cd\u5176\u4ed6\u6307\u9488\u548c\u6570\u636e\u526f\u672c\u5417&#xff1f;<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>q <span class=\"token operator\">&#061;<\/span> p<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5047\u8bbe p \u6709\u6548&#xff0c;\u6240\u6307\u6574\u6570\u5df2\u7ecf\u521d\u59cb\u5316<\/span><\/p>\n<p><span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\np <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u91ca\u653e\u540e&#xff1a;<\/p>\n<ul>\n<li>q \u4e0d\u4f1a\u81ea\u52a8\u53d8\u6210 NULL\u3002<\/li>\n<li>\u4e0d\u80fd\u518d\u901a\u8fc7 q \u8bbf\u95ee\u539f\u5bf9\u8c61&#xff0c;\u4e5f\u4e0d\u80fd\u518d\u6b21\u91ca\u653e\u5b83\u3002<\/li>\n<li>result \u662f\u72ec\u7acb\u7684\u6574\u6570\u526f\u672c&#xff0c;\u4e0d\u53d7\u539f\u5185\u5b58\u91ca\u653e\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<p>\u590d\u5236\u5730\u5740\u4e0e\u590d\u5236\u6570\u636e&#xff0c;\u5f97\u5230\u7684\u662f\u4e0d\u540c\u7684\u4e1c\u897f\u3002<\/p>\n<p>\u66f4\u51c6\u786e\u5730\u8bf4&#xff1a;\u91ca\u653e\u540e&#xff0c;\u4e0d\u5e94\u7ee7\u7eed\u8bfb\u53d6\u3001\u6bd4\u8f83\u6216\u4f7f\u7528\u8fd9\u4e9b\u5931\u6548\u7684\u65e7\u6307\u9488\u503c&#xff1b;\u53ef\u4ee5\u76f4\u63a5\u7ed9\u76f8\u5e94\u6307\u9488\u53d8\u91cf\u91cd\u65b0\u8d4b\u503c&#xff0c;\u4f8b\u5982 q &#061; NULL\u3002<\/p>\n<h4>25. \u51fd\u6570\u6307\u9488\u4e0e\u51fd\u6570\u8c03\u7528\u6709\u4ec0\u4e48\u533a\u522b&#xff1f;<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> add<span class=\"token punctuation\">;<\/span><br \/>\np <span class=\"token operator\">&#061;<\/span> sub<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u53ea\u662f\u9009\u62e9\u8981\u6307\u5411\u7684\u51fd\u6570&#xff0c;\u6ca1\u6709\u6267\u884c\u52a0\u6cd5\u6216\u51cf\u6cd5\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">p<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u624d\u662f\u8c03\u7528\u51fd\u6570\u3002<\/p>\n<p>\u5bf9\u6bd4&#xff1a;<\/p>\n<p>p <span class=\"token operator\">&#061;<\/span> sub<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e0e&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ p &#061; sub(3, 4);<\/span><\/p>\n<p>\u524d\u8005\u7ed9 p \u8d4b\u51fd\u6570\u6307\u9488\u503c\u3002<\/p>\n<p>\u540e\u8005\u5148\u8c03\u7528 sub&#xff0c;\u5f97\u5230\u4e00\u4e2a int \u8fd4\u56de\u503c&#xff0c;\u518d\u8bd5\u56fe\u8d4b\u7ed9\u51fd\u6570\u6307\u9488&#xff0c;\u4e0d\u7b26\u5408\u8fd9\u91cc\u7684\u7c7b\u578b\u8981\u6c42\u3002<\/p>\n<h4>26. \u56de\u8c03\u4e3a\u4ec0\u4e48\u6709\u7528&#xff1f;\u7c7b\u578b\u8981\u6ee1\u8db3\u4ec0\u4e48\u8981\u6c42&#xff1f;<\/h4>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">calculate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> y<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>op<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">op<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u901a\u8fc7\u4f20\u5165 add \u6216 sub&#xff0c;\u53ef\u4ee5\u8ba9\u540c\u4e00\u6bb5\u8c03\u7528\u8fc7\u7a0b\u4f7f\u7528\u4e0d\u540c\u7684\u8ba1\u7b97\u89c4\u5219\u3002<\/p>\n<p>\u51fd\u6570\u5fc5\u987b\u4e0e\u8981\u6c42\u7684\u7c7b\u578b\u517c\u5bb9\u3002\u8fd9\u91cc\u8981\u6c42&#xff1a;<\/p>\n<ul>\n<li>\u4e24\u4e2a int \u53c2\u6570\u3002<\/li>\n<li>\u8fd4\u56de int\u3002<\/li>\n<li>\u53c2\u6570\u540d\u5b57\u4e0d\u5f71\u54cd\u51fd\u6570\u7c7b\u578b\u3002<\/li>\n<\/ul>\n<p>\u56de\u8c03\u8fd8\u8981\u9075\u5b88\u8fd4\u56de\u503c\u7684\u542b\u4e49\u7ea6\u5b9a\u3002\u4f8b\u5982&#xff0c;qsort \u7684\u6bd4\u8f83\u51fd\u6570\u7ea6\u5b9a&#xff1a;<\/p>\n<table>\n<tr>\u8fd4\u56de\u503c\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>\u5c0f\u4e8e 0<\/td>\n<td>\u7b2c\u4e00\u4e2a\u5143\u7d20\u5e94\u6392\u5728\u7b2c\u4e8c\u4e2a\u5143\u7d20\u524d<\/td>\n<\/tr>\n<tr>\n<td>\u7b49\u4e8e 0<\/td>\n<td>\u4e24\u4e2a\u5143\u7d20\u5728\u5f53\u524d\u6bd4\u8f83\u89c4\u5219\u4e0b\u76f8\u7b49<\/td>\n<\/tr>\n<tr>\n<td>\u5927\u4e8e 0<\/td>\n<td>\u7b2c\u4e00\u4e2a\u5143\u7d20\u5e94\u6392\u5728\u7b2c\u4e8c\u4e2a\u5143\u7d20\u540e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e0b\u9762\u6309\u6574\u6570\u503c\u4ece\u5c0f\u5230\u5927\u6392\u5e8f&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">compare_int<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>left<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>right<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>a <span class=\"token operator\">&#061;<\/span> left<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>b <span class=\"token operator\">&#061;<\/span> right<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>a <span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">*<\/span>b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>a <span class=\"token operator\">&lt;<\/span> <span class=\"token operator\">*<\/span>b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">30<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">size_t<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span> a <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">sizeof<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">qsort<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> compare_int<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">size_t<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d &#034;<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">putchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token char\">&#039;\\\\n&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa&#xff1a;<\/p>\n<p>10 20 30<\/p>\n<p>qsort \u8d1f\u8d23\u6392\u5e8f\u8fc7\u7a0b&#xff0c;compare_int \u8d1f\u8d23\u6bd4\u8f83\u89c4\u5219\u3002<\/p>\n<p>\u8fd9\u91cc\u6ca1\u6709\u76f4\u63a5\u5199&#xff1a;<\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token operator\">*<\/span>a <span class=\"token operator\">&#8211;<\/span> <span class=\"token operator\">*<\/span>b<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u56e0\u4e3a\u4e24\u4e2a int \u76f8\u51cf\u53ef\u80fd\u53d1\u751f\u6709\u7b26\u53f7\u6574\u6570\u6ea2\u51fa&#xff1b;\u4f7f\u7528\u5173\u7cfb\u6bd4\u8f83\u53ef\u4ee5\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n<p>\u5982\u679c\u6362\u6210\u6309\u7edd\u5bf9\u503c\u4ece\u5c0f\u5230\u5927\u6392\u5e8f&#xff0c;\u90a3\u4e48\u6bd4\u8f83 -8 \u548c 3 \u65f6\u5e94\u8fd4\u56de\u6b63\u6570&#xff0c;\u56e0\u4e3a 3 \u7684\u7edd\u5bf9\u503c\u66f4\u5c0f&#xff0c;\u5e94\u6392\u5728\u524d\u9762\u3002<\/p>\n<p>\u56de\u8c03\u8ba9\u901a\u7528\u8fc7\u7a0b\u4e0e\u5177\u4f53\u89c4\u5219\u5206\u5f00&#xff1a;\u8fc7\u7a0b\u53ef\u4ee5\u5171\u7528&#xff0c;\u89c4\u5219\u53ef\u4ee5\u66ff\u6362\u3002<\/p>\n<h4>27.\u6307\u9488\u4f7f\u7528\u4e2d\u4e09\u4e2a\u5bb9\u6613\u9057\u6f0f\u7684\u95ee\u9898<\/h4>\n<h5>(1) \u58f0\u660e\u6307\u9488&#xff0c;\u4e0d\u4f1a\u81ea\u52a8\u521b\u5efa\u5b83\u6307\u5411\u7684\u5bf9\u8c61<\/h5>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u91cc\u53ea\u5b9a\u4e49\u4e86\u4e00\u4e2a\u6307\u9488\u53d8\u91cf\u3002\u4f5c\u4e3a\u672a\u521d\u59cb\u5316\u7684\u666e\u901a\u5c40\u90e8\u53d8\u91cf&#xff0c;p\u6ca1\u6709\u53ef\u4f9b\u4f7f\u7528\u7684\u660e\u786e\u6307\u9488\u503c&#xff0c;\u4e0d\u80fd\u76f4\u63a5\u901a\u8fc7\u5b83\u8bfb\u5199&#xff1a;<\/p>\n<p><span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u9519\u8bef<\/span><\/p>\n<p>\u9700\u8981\u5148\u8ba9\u5b83\u6307\u5411\u6709\u6548\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ a\u53d8\u621010<\/span><\/p>\n<p>\u4e5f\u53ef\u4ee5\u5148\u521d\u59cb\u5316\u4e3a\u7a7a\u6307\u9488&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u8868\u793ap\u6682\u65f6\u4e0d\u6307\u5411\u5bf9\u8c61&#xff0c;\u5e76\u4e0d\u662f\u7ed9\u5b83\u7533\u8bf7\u4e86\u5b58\u653e\u6574\u6570\u7684\u7a7a\u95f4\u3002\u53d6\u5f97\u6709\u6548\u5bf9\u8c61\u7684\u5730\u5740\u524d&#xff0c;\u4ecd\u4e0d\u80fd\u89e3\u5f15\u7528\u3002<\/p>\n<h5>(2) \u4e0b\u6807\u8bbf\u95ee\u4e0e\u6307\u9488\u8bbf\u95ee\u7684\u5173\u7cfb<\/h5>\n<p>C\u4e2d&#xff0c;a[i]\u5b9a\u4e49\u4e3a*(a &#043; i)\u3002\u4e5f\u5c31\u662f\u5148\u627e\u5230\u504f\u79fbi\u4e2a\u5143\u7d20\u7684\u4f4d\u7f6e&#xff0c;\u518d\u8bbf\u95ee\u5bf9\u5e94\u5bf9\u8c61\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ 20<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 20<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> p<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ 20<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 20<\/span><\/p>\n<p>\u56e0\u6b64&#xff0c;\u4e0b\u6807\u8fd0\u7b97\u4e0d\u53ea\u7528\u4e8e\u6570\u7ec4\u540d&#xff0c;\u4e5f\u53ef\u4ee5\u7528\u4e8e\u6307\u9488\u3002\u4f46\u80fd\u5199\u4e0b\u6807&#xff0c;\u4e0d\u4ee3\u8868\u6307\u9488\u77e5\u9053\u6570\u7ec4\u957f\u5ea6&#xff1b;\u7a0b\u5e8f\u4ecd\u9700\u8981\u4fdd\u8bc1\u8bbf\u95ee\u6ca1\u6709\u8d8a\u754c\u3002<\/p>\n<h5>(3) \u5b57\u7b26\u6570\u7ec4\u4e0e\u6307\u5411\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u7684\u6307\u9488<\/h5>\n<p><span class=\"token keyword\">char<\/span> a<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>a\u662f\u5b57\u7b26\u6570\u7ec4&#xff0c;\u5305\u542bh\u3001e\u3001l\u3001l\u3001o\u3001\\\\0&#xff0c;\u51716\u4e2a\u5b57\u7b26&#xff0c;\u53ef\u4ee5\u4fee\u6539\u5176\u4e2d\u7684\u5143\u7d20&#xff1a;<\/p>\n<p>a<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;H&#039;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ a\u4e2d\u7684\u5b57\u7b26\u4e32\u53d8\u6210&#034;Hello&#034;<\/span><\/p>\n<p>p\u662f\u6307\u9488\u53d8\u91cf&#xff0c;\u6307\u5411\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u3002\u4e0d\u80fd\u4fee\u6539\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u7684\u5185\u5bb9\u3002<\/p>\n<p>\u5373\u4f7f\u5728C\u4e2d\u5199\u6210char *p &#061; &#034;hello&#034;;&#xff0c;\u4e5f\u4e0d\u610f\u5473\u7740\u5b57\u9762\u91cf\u53ef\u4fee\u6539\u3002\u901a\u8fc7\u5b83\u5199\u5165\u5c5e\u4e8e\u672a\u5b9a\u4e49\u884c\u4e3a&#xff0c;\u56e0\u6b64\u4f7f\u7528const char *\u66f4\u6e05\u695a\u3002<\/p>\n<p>\u4e0d\u8fc7&#xff0c;\u53ef\u4ee5\u6539\u53d8p\u7684\u6307\u5411&#xff1a;<\/p>\n<p>p <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;world&#034;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5408\u6cd5&#xff0c;p\u6539\u4e3a\u6307\u5411\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u5b57\u9762\u91cf<\/span><\/p>\n<p>\u8fd9\u6ca1\u6709\u4fee\u6539\u539f\u6765\u7684&#034;hello&#034;&#xff0c;\u53ea\u662f\u6539\u53d8\u4e86p\u4fdd\u5b58\u7684\u6307\u9488\u503c\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u672c\u7bc7\u5168\u90e8\u5185\u5bb9&#xff0c;\u8003\u8651\u5230\u6587\u7ae0\u7bc7\u5e45&#xff0c;\u8fd9\u91cc\u5e76\u6ca1\u6709\u52a0\u5165\u7ec3\u4e60\u793a\u4f8b&#xff0c;\u4f46C\u8bed\u8a00\u7684\u5b66\u4e60\u770b\u91cd\u5b9e\u8df5&#xff0c;\u5e94\u5f53\u4ee5\u7ec8\u4e3a\u59cb&#xff0c;\u66f4\u591a\u7ec3\u4e60\u5c06\u5728\u4e4b\u540e\u66f4\u65b0\u3002\u5982\u679c\u5bf9\u4f60\u6709\u4e00\u70b9\u70b9\u5e2e\u52a9&#xff0c;\u8fd8\u8bf7\u70b9\u8d5e\u5173\u6ce8&#xff0c;\u6211\u4f1a\u6301\u7eed\u8f93\u51fa\u6709\u8d28\u91cf\u7684\u5185\u5bb9\u3002<\/p>\n<p>\u5b66\u4e60\u8def\u4e0a&#xff0c;\u6211\u4eec\u5e38\u5728\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e07\u5b57\u8be6\u89e3&#xff1a;C \u6307\u9488\u4e0e\u52a8\u6001\u5185\u5b58\u5206\u914d<br \/>\n\u6307\u9488\u662f C \u8bed\u8a00\u4e2d\u7684\u91cd\u8981\u77e5\u8bc6\u70b9\u3002\u7406\u89e3\u6307\u9488&#xff0c;\u4e0d\u80fd\u53ea\u8bb0\u4f4f\u67d0\u79cd\u5199\u6cd5&#xff0c;\u8fd8\u9700\u8981\u5206\u6e05\u6307\u9488\u53d8\u91cf\u3001\u6307\u9488\u503c\u3001\u6240\u6307\u5bf9\u8c61&#xff0c;\u4ee5\u53ca\u5b83\u4eec\u5404\u81ea\u7684\u7c7b\u578b\u548c\u751f\u547d\u5468\u671f\u3002\u672c\u6587\u9488\u5bf9\u6307\u9488\u76f8\u5173\u5bb9\u6613\u6df7\u6dc6\u7684\u95ee\u9898&#xff0c;\u901a\u8fc7\u8bf4\u660e\u3001\u5bf9\u6bd4\u548c\u95ee\u7b54\u5f62\u5f0f\u8bb2\u89e3\u8fd9\u4e9b\u77e5\u8bc6\u3002 \u672c\u7bc7\u4e4b\u540e\u8fd8\u6709\u66f4\u591a\u5176\u4ed6\u5185\u5bb9&#xff1a;\u4e00\u6587\u8be6\u89e3&#xff1a;C\u7ed3\u6784\u4f53\u3001\u4e00\u6587\u8be6\u89e3&#xff1a;C\u679a\u4e3e\u3001\u4e00\u6587\u8be6\u89e3&#xff1a;C\u5171\u7528\u4f53<br \/>\n\u76ee\u5f55<br \/>\n\u4e00\u3001\u6307\u9488\u542b\u4e49\u4e0e\u7c7b\u578b\u4e8c\u3001<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11653,174,790,371,123,4405],"topic":[],"class_list":["post-106722","post","type-post","status-publish","format-standard","hentry","category-server","tag-11653","tag-c","tag-visual-studio","tag-371","tag-123","tag-4405"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u8bed\u8a00\u6307\u9488\u4e0e\u52a8\u6001\u5185\u5b58\uff1a\u4ece\u5730\u5740\u3001\u6570\u7ec4\u5230 malloc\/realloc\uff0c\u4e07\u5b57\u8bb2\u900f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/106722.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u8bed\u8a00\u6307\u9488\u4e0e\u52a8\u6001\u5185\u5b58\uff1a\u4ece\u5730\u5740\u3001\u6570\u7ec4\u5230 malloc\/realloc\uff0c\u4e07\u5b57\u8bb2\u900f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u4e07\u5b57\u8be6\u89e3&#xff1a;C \u6307\u9488\u4e0e\u52a8\u6001\u5185\u5b58\u5206\u914d \u6307\u9488\u662f C 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