{"id":49933,"date":"2025-07-30T20:37:10","date_gmt":"2025-07-30T12:37:10","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/49933.html"},"modified":"2025-07-30T20:37:10","modified_gmt":"2025-07-30T12:37:10","slug":"c%e8%af%ad%e8%a8%80%ef%bc%9a%e6%8c%87%e9%92%88-2","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/49933.html","title":{"rendered":"C\u8bed\u8a00\uff1a\u6307\u9488"},"content":{"rendered":"<h4 style=\"background-color:transparent\">C\u8bed\u8a00\u6307\u9488\u77e5\u8bc6\u603b\u7ed3<\/h4>\n<hr \/>\n<h5>\u4e00\u3001\u6307\u9488\u7684\u672c\u8d28\u4e0e\u57fa\u7840\u6982\u5ff5<\/h5>\n<p>\u6307\u9488\u662fC\u8bed\u8a00\u7684\u7075\u9b42&#xff0c;\u5b83\u662f\u4e13\u95e8\u5b58\u50a8\u5185\u5b58\u5730\u5740\u7684\u53d8\u91cf\u7c7b\u578b\u3002\u7406\u89e3\u6307\u9488\u662f\u638c\u63e1C\u8bed\u8a00\u7684\u5173\u952e\u3002<\/p>\n<p>\u6838\u5fc3\u6982\u5ff5&#xff1a;<\/p>\n<li>\n<p>\u5b9a\u4e49\u683c\u5f0f&#xff1a;\u6307\u5411\u7684\u7a7a\u95f4\u7c7b\u578b *\u53d8\u91cf\u540d;<\/p>\n<p>int num &#061; 100;        \/\/ \u666e\u901a\u6574\u578b\u53d8\u91cf<br \/>\nint *p &#061; &amp;num;       \/\/ p\u662f\u6307\u5411\u6574\u578b\u53d8\u91cf\u7684\u6307\u9488<\/p>\n<ul>\n<li>\n<p>p\u5b58\u50a8num\u7684\u5185\u5b58\u5730\u5740<\/p>\n<\/li>\n<li>\n<p>*p\u53ef\u76f4\u63a5\u64cd\u4f5cnum\u7684\u503c&#xff08;\u89e3\u5f15\u7528&#xff09;<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6307\u9488\u5927\u5c0f\u4e0e\u7cfb\u7edf\u5173\u7cfb&#xff1a;<\/p>\n<table>\n<tr>\u7cfb\u7edf\u67b6\u6784\u6307\u9488\u5927\u5c0f\u793a\u4f8b\u4ee3\u7801<\/tr>\n<tbody>\n<tr>\n<td>32\u4f4d\u7cfb\u7edf<\/td>\n<td>4\u5b57\u8282<\/td>\n<td>sizeof(int*) &#061;&#061; 4<\/td>\n<\/tr>\n<tr>\n<td>64\u4f4d\u7cfb\u7edf<\/td>\n<td>8\u5b57\u8282<\/td>\n<td>sizeof(void*) &#061;&#061; 8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/li>\n<li>\n<p>\u91ce\u6307\u9488\u4e0e\u7a7a\u6307\u9488&#xff1a;<\/p>\n<p>\/\/ \u5371\u9669&#xff01;\u91ce\u6307\u9488&#xff08;\u6307\u5411\u968f\u673a\u5730\u5740&#xff09;<br \/>\nint *wild_ptr;<br \/>\n*wild_ptr &#061; 100;  \/\/ \u53ef\u80fd\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83<\/p>\n<p>\/\/ \u5b89\u5168\u505a\u6cd5&#xff1a;\u521d\u59cb\u5316\u4e3aNULL<br \/>\nint *safe_ptr &#061; NULL;<br \/>\nif (safe_ptr !&#061; NULL) {<br \/>\n    *safe_ptr &#061; 200;  \/\/ \u5b89\u5168\u8bbf\u95ee<br \/>\n}\n<\/li>\n<p>\u7ecf\u5178\u6848\u4f8b&#xff1a;<\/p>\n<p>#include &lt;stdio.h&gt;<\/p>\n<p>int main() {<br \/>\n    int score &#061; 95;<br \/>\n    int *p_score &#061; &amp;score;<\/p>\n<p>    printf(&#034;\u53d8\u91cf\u5730\u5740: %p\\\\n&#034;, &amp;score);      \/\/ 0x7ffd42a<br \/>\n    printf(&#034;\u6307\u9488\u5b58\u50a8\u7684\u5730\u5740: %p\\\\n&#034;, p_score); \/\/ \u540c\u4e0a<br \/>\n    printf(&#034;\u901a\u8fc7\u6307\u9488\u8bbf\u95ee\u503c: %d\\\\n&#034;, *p_score); \/\/ 95<\/p>\n<p>    *p_score &#061; 100;  \/\/ \u4fee\u6539\u539f\u53d8\u91cf\u503c<br \/>\n    printf(&#034;\u4fee\u6539\u540e\u7684\u5206\u6570: %d\\\\n&#034;, score);    \/\/ 100<\/p>\n<p>    return 0;<br \/>\n}<\/p>\n<hr \/>\n<h5>\u4e8c\u3001\u591a\u7ea7\u6307\u9488\u6df1\u5ea6\u89e3\u6790<\/h5>\n<p>\u4e8c\u7ea7\u6307\u9488\u662f\u6307\u5411\u6307\u9488\u7684\u6307\u9488&#xff0c;\u5e38\u7528\u4e8e\u52a8\u6001\u5185\u5b58\u7ba1\u7406\u548c\u51fd\u6570\u53c2\u6570\u4f20\u9012\u3002<\/p>\n<p>\u5185\u5b58\u6a21\u578b&#xff1a;<\/p>\n<p>text<\/p>\n<p>         \u4e8c\u7ea7\u6307\u9488       \u4e00\u7ea7\u6307\u9488        \u53d8\u91cf<br \/>\n        &#043;&#8212;&#8212;-&#043;    &#043;&#8212;&#8212;-&#043;    &#043;&#8212;&#8212;-&#043;<br \/>\npp &#8212;&gt; | \u5730\u5740  | -&gt; | \u5730\u5740  | -&gt; | \u503c    |<br \/>\n        &#043;&#8212;&#8212;-&#043;    &#043;&#8212;&#8212;-&#043;    &#043;&#8212;&#8212;-&#043;<\/p>\n<p>\u5b9e\u7528\u6848\u4f8b&#xff1a;<\/p>\n<p>#include &lt;stdio.h&gt;<\/p>\n<p>int main() {<br \/>\n    int classroom &#061; 301;<br \/>\n    int *p_room &#061; &amp;classroom;     \/\/ \u4e00\u7ea7\u6307\u9488<br \/>\n    int **pp_room &#061; &amp;p_room;      \/\/ \u4e8c\u7ea7\u6307\u9488<\/p>\n<p>    printf(&#034;\u6559\u5ba4\u53f7: %d\\\\n&#034;, classroom);        \/\/ 301<br \/>\n    printf(&#034;\u901a\u8fc7\u4e00\u7ea7\u6307\u9488\u8bbf\u95ee: %d\\\\n&#034;, *p_room);   \/\/ 301<br \/>\n    printf(&#034;\u901a\u8fc7\u4e8c\u7ea7\u6307\u9488\u8bbf\u95ee: %d\\\\n&#034;, **pp_room); \/\/ 301<\/p>\n<p>    \/\/ \u4fee\u6539\u539f\u59cb\u503c<br \/>\n    **pp_room &#061; 501;<br \/>\n    printf(&#034;\u4fee\u6539\u540e\u7684\u6559\u5ba4\u53f7: %d\\\\n&#034;, classroom); \/\/ 501<\/p>\n<p>    return 0;<br \/>\n}<\/p>\n<p>\u6307\u9488\u504f\u79fb\u7279\u6027&#xff1a;<\/p>\n<p>int arr[3] &#061; {10, 20, 30};<br \/>\nint *p &#061; arr;<\/p>\n<p>printf(&#034;*(p&#043;1) &#061; %d\\\\n&#034;, *(p&#043;1));  \/\/ 20&#xff08;\u504f\u79fb4\u5b57\u8282&#xff09;<br \/>\nprintf(&#034;p[2] &#061; %d\\\\n&#034;, p[2]);      \/\/ 30&#xff08;\u6570\u7ec4\u8868\u793a\u6cd5&#xff09;<\/p>\n<hr \/>\n<h5>\u4e09\u3001\u6307\u9488\u4e0e\u6570\u7ec4\u7684\u6df1\u5ea6\u4e92\u52a8<\/h5>\n<h6>1. \u6570\u7ec4\u6307\u9488 vs \u6307\u9488\u6570\u7ec4<\/h6>\n<table>\n<tr>\u7c7b\u578b\u5b9a\u4e49\u7279\u70b9\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td>\u6570\u7ec4\u6307\u9488<\/td>\n<td>int (*p)[5]<\/td>\n<td>\u6307\u5411\u6574\u4e2a\u6570\u7ec4<\/td>\n<td>\u7528\u4e8e\u4e8c\u7ef4\u6570\u7ec4\u64cd\u4f5c<\/td>\n<\/tr>\n<tr>\n<td>\u6307\u9488\u6570\u7ec4<\/td>\n<td>int *arr[5]<\/td>\n<td>\u5143\u7d20\u90fd\u662f\u6307\u9488<\/td>\n<td>\u5b58\u50a8\u591a\u4e2a\u5b57\u7b26\u4e32\u5730\u5740<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h6>2. \u4e00\u7ef4\u6570\u7ec4\u64cd\u4f5c<\/h6>\n<p>int scores[5] &#061; {85, 90, 78, 92, 88};<br \/>\nint *p &#061; scores;  \/\/ \u7b49\u4ef7\u4e8e &amp;scores[0]<\/p>\n<p>\/\/ \u56db\u79cd\u8bbf\u95ee\u65b9\u5f0f\u7b49\u4ef7<br \/>\nprintf(&#034;\u7b2c\u4e09\u4f4d\u5b66\u751f\u5206\u6570: %d\\\\n&#034;, scores[2]);    \/\/ 78<br \/>\nprintf(&#034;\u901a\u8fc7\u6307\u9488: %d\\\\n&#034;, *(p &#043; 2));          \/\/ 78<br \/>\nprintf(&#034;\u6df7\u5408\u8bbf\u95ee1: %d\\\\n&#034;, *(scores &#043; 2));     \/\/ 78<br \/>\nprintf(&#034;\u6df7\u5408\u8bbf\u95ee2: %d\\\\n&#034;, p[2]);             \/\/ 78<\/p>\n<h6>3. \u4e8c\u7ef4\u6570\u7ec4\u64cd\u4f5c<\/h6>\n<p>int matrix[3][4] &#061; {<br \/>\n    {1, 2, 3, 4},<br \/>\n    {5, 6, 7, 8},<br \/>\n    {9, 10, 11, 12}<br \/>\n};<\/p>\n<p>\/\/ \u6570\u7ec4\u6307\u9488\u58f0\u660e<br \/>\nint (*p)[4] &#061; matrix;<\/p>\n<p>\/\/ \u8bbf\u95ee\u5143\u7d207 (row&#061;1, col&#061;2)<br \/>\nprintf(&#034;\u5143\u7d207\u7684\u56db\u79cd\u8bbf\u95ee\u65b9\u5f0f:\\\\n&#034;);<br \/>\nprintf(&#034;1. matrix[1][2] &#061; %d\\\\n&#034;, matrix[1][2]);<br \/>\nprintf(&#034;2. *(*(matrix&#043;1)&#043;2) &#061; %d\\\\n&#034;, *(*(matrix&#043;1)&#043;2));<br \/>\nprintf(&#034;3. *(*(p&#043;1)&#043;2) &#061; %d\\\\n&#034;, *(*(p&#043;1)&#043;2));<br \/>\nprintf(&#034;4. p[1][2] &#061; %d\\\\n&#034;, p[1][2]);<\/p>\n<p>\u5185\u5b58\u5e03\u5c40&#xff1a;<\/p>\n<p>text<\/p>\n<p>matrix \u2192 [1,2,3,4]   \/\/ matrix[0]<br \/>\n         [5,6,7,8]   \/\/ matrix[1]<br \/>\n         [9,10,11,12]\/\/ matrix[2]<\/p>\n<p>*(matrix&#043;1) \u2192 \u83b7\u53d6\u7b2c\u4e8c\u884c\u9996\u5730\u5740<br \/>\n*(*(matrix&#043;1)&#043;2) \u2192 \u7b2c\u4e8c\u884c\u7b2c\u4e09\u4e2a\u5143\u7d20<\/p>\n<hr \/>\n<h5 style=\"background-color:transparent\">\u56db\u3001C\u8bed\u8a00\u5185\u5b58\u8be6\u89e3<\/h5>\n<h6>1. \u6808\u533a&#xff08;Stack&#xff09;<\/h6>\n<ul>\n<li>\n<p>\u5b58\u50a8\u5185\u5bb9&#xff1a;\u5c40\u90e8\u53d8\u91cf\u3001\u51fd\u6570\u53c2\u6570<\/p>\n<\/li>\n<li>\n<p>\u7279\u70b9&#xff1a;\u81ea\u52a8\u5206\u914d\/\u91ca\u653e&#xff0c;\u901f\u5ea6\u5feb<\/p>\n<\/li>\n<li>\n<p>\u793a\u4f8b<\/p>\n<p>void function() {<br \/>\n    int local_var &#061; 10;  \/\/ \u6808\u533a\u5206\u914d<br \/>\n}  \/\/ \u51fd\u6570\u7ed3\u675f\u81ea\u52a8\u91ca\u653e\n<\/li>\n<\/ul>\n<h6>2. \u5806\u533a&#xff08;Heap&#xff09;<\/h6>\n<ul>\n<li>\n<p>\u5b58\u50a8\u5185\u5bb9&#xff1a;malloc\/calloc\u52a8\u6001\u5206\u914d\u7684\u5185\u5b58<\/p>\n<\/li>\n<li>\n<p>\u7279\u70b9&#xff1a;\u624b\u52a8\u7ba1\u7406&#xff0c;\u751f\u547d\u5468\u671f\u7531\u7a0b\u5e8f\u5458\u63a7\u5236<\/p>\n<\/li>\n<li>\n<p>\u793a\u4f8b<\/p>\n<p>int *arr &#061; malloc(5 * sizeof(int));  \/\/ \u5806\u533a\u5206\u914d<br \/>\nfree(arr);  \/\/ \u5fc5\u987b\u624b\u52a8\u91ca\u653e!\n<\/li>\n<\/ul>\n<h6>3. \u5168\u5c40\/\u9759\u6001\u533a<\/h6>\n<ul>\n<li>\n<p>\u5b58\u50a8\u5185\u5bb9&#xff1a;\u5168\u5c40\u53d8\u91cf\u3001static\u53d8\u91cf<\/p>\n<\/li>\n<li>\n<p>\u7279\u70b9&#xff1a;\u7a0b\u5e8f\u542f\u52a8\u65f6\u5206\u914d&#xff0c;\u7ed3\u675f\u65f6\u91ca\u653e<\/p>\n<\/li>\n<li>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p>int global_var;         \/\/ \u5168\u5c40\u53d8\u91cf<br \/>\nvoid func() {<br \/>\n    static int count &#061; 0; \/\/ \u9759\u6001\u53d8\u91cf<br \/>\n}\n<\/li>\n<\/ul>\n<h6>4. \u5e38\u91cf\u533a&#xff08;\u5173\u952e\u533a\u522b&#xff01;&#xff09;<\/h6>\n<ul>\n<li>\n<p>\u5b58\u50a8\u5185\u5bb9&#xff1a;\u5b57\u7b26\u4e32\u5e38\u91cf\u3001const\u5168\u5c40\u53d8\u91cf<\/p>\n<\/li>\n<li>\n<p>\u7279\u70b9&#xff1a;\u53ea\u8bfb&#xff0c;\u4e0d\u53ef\u4fee\u6539<\/p>\n<\/li>\n<li>\n<p>\u7ecf\u5178\u6848\u4f8b&#xff1a;<\/p>\n<p>char *p1 &#061; &#034;Hello&#034;;  \/\/ &#034;Hello&#034;\u5728\u5e38\u91cf\u533a<br \/>\nchar p2[] &#061; &#034;World&#034;; \/\/ &#034;World&#034;\u5728\u6808\u533a&#xff08;\u53ef\u4fee\u6539\u526f\u672c&#xff09;<\/p>\n<p>\/\/ p1[0] &#061; &#039;h&#039;;  \/\/ \u9519\u8bef&#xff01;\u5c1d\u8bd5\u4fee\u6539\u5e38\u91cf\u533a<br \/>\np2[0] &#061; &#039;w&#039;;     \/\/ \u6b63\u786e&#xff01;\u4fee\u6539\u6808\u533a\u526f\u672c\n<\/li>\n<\/ul>\n<h6>5. \u4ee3\u7801\u6bb5<\/h6>\n<ul>\n<li>\n<p>\u5b58\u50a8\u5185\u5bb9&#xff1a;\u7a0b\u5e8f\u6267\u884c\u7684\u4e8c\u8fdb\u5236\u4ee3\u7801<\/p>\n<\/li>\n<li>\n<p>\u7279\u70b9&#xff1a;\u53ea\u8bfb&#xff0c;\u5b58\u653e\u51fd\u6570\u4f53\u4ee3\u7801<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h5>\u4e94\u3001const\u5173\u952e\u5b57\u7684\u6df1\u5ea6\u5e94\u7528<\/h5>\n<h6>1. \u57fa\u7840\u7528\u6cd5<\/h6>\n<p>const int MAX_SIZE &#061; 100;  \/\/ \u5e38\u91cf<br \/>\n\/\/ MAX_SIZE &#061; 200;        \/\/ \u7f16\u8bd1\u9519\u8bef&#xff01;<\/p>\n<h6>2. \u6307\u9488\u4fdd\u62a4&#xff08;\u56db\u79cd\u6a21\u5f0f&#xff09;<\/h6>\n<p>int value &#061; 10;<br \/>\nint another &#061; 20;<\/p>\n<p>\/\/ 1. \u6307\u5411\u5e38\u91cf\u7684\u6307\u9488&#xff08;\u4fdd\u62a4\u6307\u5411\u7684\u6570\u636e&#xff09;<br \/>\nconst int *p1 &#061; &amp;value;<br \/>\n\/\/ *p1 &#061; 100;  \/\/ \u9519\u8bef&#xff01;\u4e0d\u80fd\u4fee\u6539\u6570\u636e<br \/>\np1 &#061; &amp;another; \/\/ \u5141\u8bb8\u6539\u53d8\u6307\u5411<\/p>\n<p>\/\/ 2. \u5e38\u91cf\u6307\u9488&#xff08;\u4fdd\u62a4\u6307\u9488\u672c\u8eab&#xff09;<br \/>\nint *const p2 &#061; &amp;value;<br \/>\n*p2 &#061; 100;      \/\/ \u5141\u8bb8\u4fee\u6539\u6570\u636e<br \/>\n\/\/ p2 &#061; &amp;another; \/\/ \u9519\u8bef&#xff01;\u4e0d\u80fd\u6539\u53d8\u6307\u5411<\/p>\n<p>\/\/ 3. \u53cc\u91cd\u4fdd\u62a4<br \/>\nconst int *const p3 &#061; &amp;value;<br \/>\n\/\/ *p3 &#061; 100;    \/\/ \u9519\u8bef&#xff01;<br \/>\n\/\/ p3 &#061; &amp;another; \/\/ \u9519\u8bef&#xff01;<\/p>\n<p>\/\/ 4. \u5e94\u7528\u4e8e\u6570\u7ec4\u53c2\u6570&#xff08;\u5b89\u5168\u4f20\u9012&#xff09;<br \/>\nvoid print_array(const int *arr, int size) {<br \/>\n    for (int i &#061; 0; i &lt; size; i&#043;&#043;) {<br \/>\n        \/\/ arr[i]&#043;&#043; \u4f1a\u88ab\u963b\u6b62<br \/>\n        printf(&#034;%d &#034;, arr[i]);<br \/>\n    }<br \/>\n}<\/p>\n<h6>3. \u6807\u51c6\u5e93\u5e94\u7528<\/h6>\n<p>\/\/ \u5b57\u7b26\u4e32\u51fd\u6570\u539f\u578b<br \/>\nchar *strcpy(char *dest, const char *src);<br \/>\nint strcmp(const char *s1, const char *s2);<\/p>\n<p>\/\/ \u4f7f\u7528\u793a\u4f8b<br \/>\nchar src[20] &#061; &#034;Source&#034;;<br \/>\nchar dest[20];<br \/>\nstrcpy(dest, src);  \/\/ 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