{"id":53039,"date":"2025-08-11T23:24:31","date_gmt":"2025-08-11T15:24:31","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/53039.html"},"modified":"2025-08-11T23:24:31","modified_gmt":"2025-08-11T15:24:31","slug":"c%e8%af%ad%e8%a8%80%e5%88%9d%e5%ad%a6%e8%80%85%e7%ac%94%e8%ae%b0%e3%80%90%e6%8c%87%e9%92%88%e7%9b%b8%e5%85%b3%e8%af%95%e9%a2%98%e3%80%91","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/53039.html","title":{"rendered":"C\u8bed\u8a00\u521d\u5b66\u8005\u7b14\u8bb0\u3010\u6307\u9488\u76f8\u5173\u8bd5\u9898\u3011"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u524d\u8a00<\/li>\n<li>\u4e00\u3001pandas\u662f\u4ec0\u4e48&#xff1f;<\/li>\n<li>\n<ul>\n<li>1. sizeof \u548c strlen \u5bf9\u6bd4<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001 \u6570\u7ec4\u548c\u6307\u9488\u8bd5\u9898\u89e3\u6790<\/li>\n<li>\n<ul>\n<li>1.\u4e00\u7ef4\u6570\u7ec4<\/li>\n<li>2.\u5b57\u7b26\u6570\u7ec4<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u6307\u9488\u8fd0\u7b97\u8bd5\u9898\u89e3\u6790<\/li>\n<li>\n<ul>\n<li>1.\u6570\u7ec4\u6307\u9488\u504f\u79fb<\/li>\n<li>2. \u7ed3\u6784\u4f53\u6307\u9488\u8fd0\u7b97&#xff08;X86&#xff09;<\/li>\n<li>3.\u9017\u53f7\u8868\u8fbe\u5f0f\u9677\u9631<\/li>\n<li>4.\u6570\u7ec4\u6307\u9488\u7c7b\u578b\u4e0d\u5339\u914d&#xff08;X86&#xff09;<\/li>\n<li>5.\u4e8c\u7ef4\u6570\u7ec4\u5730\u5740\u504f\u79fb<\/li>\n<li>6.\u6307\u9488\u6570\u7ec4<\/li>\n<li>7.\u4e09\u7ea7\u6307\u9488\u4e0e\u5b57\u7b26\u4e32<\/li>\n<\/ul>\n<\/li>\n<li>\u5173\u952e\u603b\u7ed3<\/li>\n<\/ul>\n<hr \/>\n<h2>\u524d\u8a00<\/h2>\n<p>\u6307\u9488\u5b66\u4e60\u7684\u5185\u5bb9\u975e\u5e38\u590d\u6742&#xff0c;\u8fd9\u91cc\u901a\u8fc7sizeof\u548cstrlen\u4e3a\u5f15\u5b50&#xff0c;\u89e3\u6790\u90e8\u5206\u6307\u9488\u76f8\u5173\u8bd5\u9898&#xff0c;\u4e3b\u8981\u6d89\u53ca\u6307\u9488\u5b9a\u4f4d\u7684\u504f\u79fb&#xff0c;\u591a\u7ea7\u6307\u9488\u53d8\u91cf\u89e3\u6790<\/p>\n<hr \/>\n<h2>\u4e00\u3001pandas\u662f\u4ec0\u4e48&#xff1f;<\/h2>\n<h3>1. sizeof \u548c strlen \u5bf9\u6bd4<\/h3>\n<table>\n<tr>\u7279\u6027sizeofstrlen<\/tr>\n<tbody>\n<tr>\n<td>\u672c\u8d28<\/td>\n<td>\u7f16\u8bd1\u65f6\u8fd0\u7b97\u7b26<\/td>\n<td>\u5e93\u51fd\u6570&#xff08;\u9700 &lt;string.h&gt;&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u529f\u80fd<\/td>\n<td>\u8ba1\u7b97\u64cd\u4f5c\u6570\u5360\u5185\u5b58\u5927\u5c0f&#xff08;\u5b57\u8282&#xff09;<\/td>\n<td>\u7edf\u8ba1 \\\\0 \u524d\u7684\u5b57\u7b26\u4e2a\u6570<\/td>\n<\/tr>\n<tr>\n<td>\u5173\u6ce8\u5185\u5bb9<\/td>\n<td>\u5185\u5b58\u7a7a\u95f4\u5927\u5c0f&#xff08;\u4e0d\u5173\u5fc3\u6570\u636e\u5185\u5bb9&#xff09;<\/td>\n<td>\u4f9d\u8d56 \\\\0 \u7ed3\u675f\u7b26&#xff08;\u65e0 \\\\0 \u4f1a\u8d8a\u754c\u8bbf\u95ee&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u64cd\u4f5c\u6570\u7c7b\u578b<\/td>\n<td>\u53d8\u91cf\u3001\u6570\u636e\u7c7b\u578b\u3001\u6570\u7ec4\u3001\u6307\u9488\u7b49<\/td>\n<td>\u5fc5\u987b\u662f\u5b57\u7b26\u4e32\u5730\u5740&#xff08;const char*&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u793a\u4f8b<\/td>\n<td>sizeof(int) &#061; 4&#xff08;32\u4f4d\u7cfb\u7edf&#xff09;<\/td>\n<td>strlen(&#034;abc&#034;) &#061; 3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5173\u952e\u533a\u522b&#xff1a;<\/p>\n<ul>\n<li>\u6570\u7ec4\u540d\u5728 sizeof \u4e2d\u7684\u610f\u4e49&#xff1a;\n<ul>\n<li>sizeof(\u6570\u7ec4\u540d)&#xff1a;\u8ba1\u7b97\u6574\u4e2a\u6570\u7ec4\u5927\u5c0f&#xff08;\u5982 int a[4] \u2192 16 \u5b57\u8282&#xff09;\u3002<\/li>\n<li>&amp;\u6570\u7ec4\u540d&#xff1a;\u53d6\u6574\u4e2a\u6570\u7ec4\u7684\u5730\u5740&#xff08;\u7c7b\u578b\u4e3a\u6570\u7ec4\u6307\u9488&#xff09;\u3002<\/li>\n<li>\u5176\u4ed6\u60c5\u51b5&#xff08;\u5982 a&#043;0&#xff09;&#xff1a;\u6570\u7ec4\u540d\u9000\u5316\u4e3a\u9996\u5143\u7d20\u5730\u5740\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h2>\u4e8c\u3001 \u6570\u7ec4\u548c\u6307\u9488\u8bd5\u9898\u89e3\u6790<\/h2>\n<h3>1.\u4e00\u7ef4\u6570\u7ec4<\/h3>\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\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/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><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 keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ 16 \u2192 \u6574\u4e2a\u6570\u7ec4\u5927\u5c0f (4\u4e2aint)<\/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 keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token operator\">&#043;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ 4\/8 \u2192 \u9996\u5143\u7d20\u5730\u5740&#xff08;\u6307\u9488\u5927\u5c0f&#xff09;<\/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 keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ 4 \u2192 a[0] (int\u7c7b\u578b)<\/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 keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ 4\/8 \u2192 \u6570\u7ec4\u6307\u9488&#xff08;\u5730\u5740\u5927\u5c0f&#xff09;<\/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 keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/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><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 4\/8 \u2192 \u5143\u7d20\u5730\u5740<\/span><\/p>\n<h3>2.\u5b57\u7b26\u6570\u7ec4<\/h3>\n<p>\u4ee3\u78011&#xff08;\u65e0 \\\\0 \u521d\u59cb\u5316&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span> arr<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#039;a&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#039;b&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#039;c&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#039;d&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#039;e&#039;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#039;f&#039;<\/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\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ 6 \u2192 \u6574\u4e2a\u6570\u7ec4\u5927\u5c0f<\/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\">strlen<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u968f\u673a\u503c \u2192 \u65e0 &#096;\\\\0&#096; \u5bfc\u81f4\u8d8a\u754c\u67e5\u627e<\/span><\/p>\n<p>\u4ee3\u78012&#xff08;\u5b57\u7b26\u4e32\u521d\u59cb\u5316&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span> arr<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;abcdef&#034;<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/\/ \u9690\u542b &#039;\\\\0&#039;<\/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 keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ 7 \u2192 \u5305\u542b &#039;\\\\0&#039;<\/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\">strlen<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ 6 \u2192 &#039;\\\\0&#039; \u524d\u5b57\u7b26\u6570<\/span><\/p>\n<p>\u4ee3\u78013&#xff08;\u6307\u9488\u6307\u5411\u5b57\u7b26\u4e32&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;abcdef&#034;<\/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\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ 4\/8 \u2192 \u6307\u9488\u5927\u5c0f<\/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\">strlen<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ 6 \u2192 \u5b57\u7b26\u4e32\u957f\u5ea6<\/span><\/p>\n<hr \/>\n<h2>\u4e09\u3001\u6307\u9488\u8fd0\u7b97\u8bd5\u9898\u89e3\u6790<\/h2>\n<h3>1.\u6570\u7ec4\u6307\u9488\u504f\u79fb<\/h3>\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\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/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 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>ptr <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 punctuation\">(<\/span><span class=\"token operator\">&amp;<\/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 comment\">\/\/ &amp;a&#043;1 \u8df3\u8fc7\u6574\u4e2a\u6570\u7ec4<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d,%d&#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 operator\">*<\/span><span class=\"token punctuation\">(<\/span>ptr<span class=\"token operator\">&#8211;<\/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\">\/\/ \u8f93\u51fa&#xff1a;2,5<\/span><\/p>\n<p>\u56fe\u89e3&#xff1a;<\/p>\n<p>a: [1][2][3][4][5] | \u8d8a\u754c\u4f4d\u7f6e<br \/>\n      \u2191     \u2191       \u2191<br \/>\n      a   a&#043;1      ptr \u2192 ptr-1\u6307\u54115<\/p>\n<hr \/>\n<h3>2. \u7ed3\u6784\u4f53\u6307\u9488\u8fd0\u7b97&#xff08;X86&#xff09;<\/h3>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Test<\/span> <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Test<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token number\">0x100000<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%p\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> p <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">0x1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ 0x100014 \u2192 \u8df3\u8fc720\u5b57\u8282\u7ed3\u6784\u4f53<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%p\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">)<\/span>p <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">0x1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 0x100001 \u2192 \u6570\u503c&#043;1<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%p\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>p <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">0x1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 0x100004 \u2192 \u8df3\u8fc74\u5b57\u8282(int)<\/span><\/p>\n<hr \/>\n<h3>3.\u9017\u53f7\u8868\u8fbe\u5f0f\u9677\u9631<\/h3>\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><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><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 number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><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> <span class=\"token comment\">\/\/ \u9017\u53f7\u8868\u8fbe\u5f0f\u2192{1,3,5}<\/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><span class=\"token number\">0<\/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> p<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> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;1<\/span><\/p>\n<p>\u5b9e\u9645\u521d\u59cb\u5316&#xff1a;<\/p>\n<p>a[0][0]&#061;1, a[0][1]&#061;3, a[1][0]&#061;5, \u5176\u4f59\u4e3a0<\/p>\n<hr \/>\n<h3>4.\u6570\u7ec4\u6307\u9488\u7c7b\u578b\u4e0d\u5339\u914d&#xff08;X86&#xff09;<\/h3>\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><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 punctuation\">(<\/span><span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ p\u7684\u6b65\u957f&#061;4\u4e2aint&#xff08;\u4f46a\u6bcf\u884c5\u4e2aint&#xff09;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%p,%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>p<span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>p<span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">[<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;0xfffffffc, -4&#xff08;\u5730\u5740\u5dee\u4e3a-4\u4e2aint&#xff09;<\/span><\/p>\n<p>\u56fe\u89e3&#xff1a;<\/p>\n<p>p[4][2] \u2192 \u6307\u5411\u7b2c18\u4e2a\u5143\u7d20&#xff08;a[3][3]&#xff09;<br \/>\na[4][2] \u2192 \u6307\u5411\u7b2c22\u4e2a\u5143\u7d20&#xff08;\u4e0b\u68074*5&#043;2&#061;22&#xff09;<br \/>\n\u5dee\u503c &#061; 18 &#8211; 22 &#061; -4<\/p>\n<hr \/>\n<h3>5.\u4e8c\u7ef4\u6570\u7ec4\u5730\u5740\u504f\u79fb<\/h3>\n<p><span class=\"token keyword\">int<\/span> aa<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><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 punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/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 number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>ptr1 <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 punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>aa <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 comment\">\/\/ \u8df3\u8fc7\u6574\u4e2a\u4e8c\u7ef4\u6570\u7ec4<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>ptr2 <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 punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>aa <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\">\/\/ \u6307\u5411\u7b2c\u4e8c\u884c\u9996\u5143\u7d20<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d,%d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>ptr1<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>ptr2<span class=\"token operator\">&#8211;<\/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\">\/\/ \u8f93\u51fa&#xff1a;10,5<\/span><\/p>\n<hr \/>\n<h3>6.\u6307\u9488\u6570\u7ec4<\/h3>\n<p><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/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 string\">&#034;work&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;at&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;alibaba&#034;<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>pa <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">;<\/span><br \/>\npa<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span>                <span class=\"token comment\">\/\/ \u6307\u5411a[1]&#xff08;&#034;at&#034;&#xff09;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>pa<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;&#034;at&#034;<\/span><\/p>\n<hr \/>\n<h3>7.\u4e09\u7ea7\u6307\u9488\u4e0e\u5b57\u7b26\u4e32<\/h3>\n<p><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>c<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;ENTER&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;NEW&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;POINT&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;FIRST&#034;<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>cp<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span>c<span class=\"token operator\">&#043;<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> c<span class=\"token operator\">&#043;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> c<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> c<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ cp[0]&#061;c&#043;3, cp[1]&#061;c&#043;2, &#8230;<\/span><br \/>\n<span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>cpp <span class=\"token operator\">&#061;<\/span> cp<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">.<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4fee\u6b63\u540e\u7684\u8868\u8fbe\u5f0f\u89e3\u6790&#xff1a;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span><span class=\"token operator\">&#043;&#043;<\/span>cpp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ &#034;POINT&#034;&#xff08;cpp\u6307\u5411cp[1]\u2192c[2]&#xff09;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">&#8212;<\/span><span class=\"token operator\">*<\/span><span class=\"token operator\">&#043;&#043;<\/span>cpp <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ &#034;ER&#034;&#xff08;cpp\u6307\u5411cp[2]&#xff0c;\u4fee\u6539\u540e\u6307\u5411c[0]&#043;3&#xff09;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>cpp<span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ &#034;ST&#034;&#xff08;cp[0]&#061;c&#043;3\u2192&#034;FIRST&#034;&#043;3&#xff09;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> cpp<span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><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 comment\">\/\/ &#034;EW&#034;&#xff08;c[1]&#061;&#034;NEW&#034;&#043;1&#xff09;<\/span><\/p>\n<hr \/>\n<h2>\u5173\u952e\u603b\u7ed3<\/h2>\n<li>\n<p>sizeof vs strlen&#xff1a;<\/p>\n<ul>\n<li>sizeof \u662f\u7f16\u8bd1\u65f6\u8fd0\u7b97\u7b26&#xff0c;strlen \u662f\u8fd0\u884c\u65f6\u51fd\u6570\u3002<\/li>\n<li>\u6570\u7ec4\u540d\u5728 sizeof \u4e2d\u4ee3\u8868\u6574\u4e2a\u6570\u7ec4&#xff0c;\u5176\u4ed6\u60c5\u51b5\u9000\u5316\u4e3a\u6307\u9488\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6307\u9488\u8fd0\u7b97\u6838\u5fc3&#xff1a;<\/p>\n<ul>\n<li>&amp;a&#043;1&#xff1a;\u8df3\u8fc7\u6574\u4e2a\u6570\u7ec4\u3002<\/li>\n<li>\u6307\u9488\u52a0\u51cf\u6574\u6570\u4ee5\u6307\u5411\u7c7b\u578b\u5927\u5c0f\u4e3a\u6b65\u957f\u3002<\/li>\n<li>\u591a\u7ea7\u6307\u9488\u9700\u9010\u5c42\u89e3\u5f15\u7528&#xff08;\u5982 ***cpp&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6613\u9519\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u9017\u53f7\u8868\u8fbe\u5f0f\u5728\u521d\u59cb\u5316\u4e2d\u7684\u9677\u9631&#xff08;(0,1) \u2192 1&#xff09;\u3002<\/li>\n<li>\u5b57\u7b26\u6570\u7ec4\u672a\u4ee5 \\\\0 \u7ed3\u5c3e\u65f6 strlen \u4f1a\u8d8a\u754c\u3002<\/li>\n<li>\u6570\u7ec4\u6307\u9488\u7c7b\u578b\u4e0d\u5339\u914d\u5bfc\u81f4\u5730\u5740\u504f\u79fb\u9519\u8bef\u3002<\/li>\n<\/ul>\n<\/li>\n<p>\u9644&#xff1a;\u6240\u6709\u9898\u76ee\u7b54\u6848\u5df2\u9a8c\u8bc1&#xff0c;\u7b26\u5408C\u6807\u51c6\u884c\u4e3a&#xff08;X86\u73af\u5883&#xff09;\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb414\u6b21\uff0c\u70b9\u8d5e3\u6b21\uff0c\u6536\u85cf9\u6b21\u3002\u6307\u9488\u5b66\u4e60\u7684\u5185\u5bb9\u975e\u5e38\u590d\u6742\uff0c\u8fd9\u91cc\u901a\u8fc7sizeof\u548cstrlen\u4e3a\u5f15\u5b50\uff0c\u89e3\u6790\u90e8\u5206\u6307\u9488\u76f8\u5173\u8bd5\u9898\uff0c\u4e3b\u8981\u6d89\u53ca\u6307\u9488\u5b9a\u4f4d\u7684\u504f\u79fb\uff0c\u591a\u7ea7\u6307\u9488\u53d8\u91cf\u89e3\u6790<\/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":[174,371,123,305,427,124],"topic":[],"class_list":["post-53039","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-371","tag-123","tag-305","tag-427","tag-124"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u8bed\u8a00\u521d\u5b66\u8005\u7b14\u8bb0\u3010\u6307\u9488\u76f8\u5173\u8bd5\u9898\u3011 - \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\/53039.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\u521d\u5b66\u8005\u7b14\u8bb0\u3010\u6307\u9488\u76f8\u5173\u8bd5\u9898\u3011 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" 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