{"id":107141,"date":"2026-09-19T04:19:54","date_gmt":"2026-09-18T20:19:54","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/107141.html"},"modified":"2026-09-19T04:19:54","modified_gmt":"2026-09-18T20:19:54","slug":"%e3%80%90c%e8%af%ad%e8%a8%80%e3%80%91%e5%88%9d%e8%af%86-c-%e8%af%ad%e8%a8%80%ef%bc%88%e7%82%b9%e5%88%b0%e4%b8%ba%e6%ad%a2%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/107141.html","title":{"rendered":"\u3010C\u8bed\u8a00\u3011\u521d\u8bc6 C \u8bed\u8a00\uff08\u70b9\u5230\u4e3a\u6b62\uff09"},"content":{"rendered":"<p>        \/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/<br \/>\n        #content_views .toc,<br \/>\n        \/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/<br \/>\n        #content_views.markdown_views &gt; p:empty:has(+ .toc),<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty,<br \/>\n        \/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/<br \/>\n        #content_views.htmledit_views #main-toc,<br \/>\n        #content_views.htmledit_views #hr-toc,<br \/>\n        #content_views.htmledit_views p[id*=\\&#8221;-toc\\&#8221;] {<br \/>\n          display: none !important;<br \/>\n        }<br \/>\n        \/* \u76ee\u5f55\u53bb\u6389\u540e\uff0c\u7d27\u8ddf\u7684\u9996\u4e2a\u6807\u9898\u4e0d\u518d\u591a\u51fa\u4e00\u5757\u4e0a\u8fb9\u8ddd *\/<br \/>\n        #content_views.markdown_views &gt; .toc + h1,<br \/>\n        #content_views.markdown_views &gt; .toc + h2,<br \/>\n        #content_views.markdown_views &gt; .toc + h3,<br \/>\n        #content_views.markdown_views &gt; .toc + h4,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h1,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h2,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h3,<br \/>\n        #content_views.markdown_views &gt; .toc + p:empty + h4 {<br \/>\n          margin-top: 0 !important;<br \/>\n        }<\/p>\n<p>C \u8bed\u8a00\u8bde\u751f\u4e8e 20 \u4e16\u7eaa 70 \u5e74\u4ee3\u3002\u5b83\u7684\u8bed\u6cd5\u5e76\u4e0d\u590d\u6742&#xff0c;\u5374\u80fd\u76f4\u63a5\u64cd\u4f5c\u5185\u5b58\u3001\u7ec4\u7ec7\u5e95\u5c42\u8d44\u6e90&#xff0c;\u56e0\u6b64\u81f3\u4eca\u4ecd\u5e7f\u6cdb\u7528\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u3001\u5d4c\u5165\u5f0f\u3001\u7f16\u8bd1\u5668\u3001\u9a71\u52a8\u548c\u9ad8\u6027\u80fd\u7a0b\u5e8f\u3002<\/p>\n<p>\u4ece\u7b2c\u4e00\u6027\u539f\u7406\u770b&#xff0c;\u7a0b\u5e8f\u53ea\u6709\u4e24\u4ef6\u4e8b&#xff1a;\u4fdd\u5b58\u6570\u636e&#xff0c;\u5904\u7406\u6570\u636e\u3002C \u8bed\u8a00\u63d0\u4f9b\u4e86\u7c7b\u578b\u3001\u53d8\u91cf\u3001\u8fd0\u7b97\u7b26\u3001\u6d41\u7a0b\u63a7\u5236\u3001\u51fd\u6570\u3001\u6570\u7ec4\u3001\u6307\u9488\u548c\u7ed3\u6784\u4f53&#xff0c;\u5e2e\u52a9\u6211\u4eec\u628a\u8fd9\u4e24\u4ef6\u4e8b\u8868\u8fbe\u6e05\u695a\u3002<\/p>\n<p>\u672c\u6587\u4e0d\u8ffd\u6c42\u4e00\u6b21\u8bb2\u5b8c\u6240\u6709\u7ec6\u8282&#xff0c;\u800c\u662f\u6cbf\u7740\u4e00\u6761\u4e3b\u7ebf&#xff0c;\u8d70\u5b8c C \u8bed\u8a00\u6700\u91cd\u8981\u7684\u57fa\u7840\u6982\u5ff5\u3002<\/p>\n<hr \/>\n<h3>1. \u7b2c\u4e00\u4e2a C \u8bed\u8a00\u7a0b\u5e8f<\/h3>\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\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/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;Hello, C!\\\\n&#034;<\/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>main \u662f\u7a0b\u5e8f\u7684\u5165\u53e3\u51fd\u6570\u3002\u4e00\u4e2a\u53ef\u6267\u884c\u7684 C \u7a0b\u5e8f\u5fc5\u987b\u6709\u4e14\u53ea\u6709\u4e00\u4e2a main \u51fd\u6570&#xff0c;\u7a0b\u5e8f\u4ece\u8fd9\u91cc\u5f00\u59cb\u6267\u884c\u3002<\/p>\n<p>\u9010\u884c\u770b&#xff1a;<\/p>\n<ul>\n<li>#include &lt;stdio.h&gt;&#xff1a;\u5305\u542b\u6807\u51c6\u8f93\u5165\u8f93\u51fa\u5e93\u7684\u58f0\u660e&#xff0c;printf \u7684\u58f0\u660e\u5c31\u5728\u8fd9\u91cc\u3002<\/li>\n<li>int main(void)&#xff1a;\u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3a main \u7684\u51fd\u6570&#xff0c;\u5b83\u8fd4\u56de int&#xff0c;\u4e14\u4e0d\u63a5\u6536\u53c2\u6570\u3002<\/li>\n<li>printf(&#8230;)&#xff1a;\u628a\u6587\u5b57\u8f93\u51fa\u5230\u7ec8\u7aef\u3002<\/li>\n<li>return 0&#xff1a;\u544a\u8bc9\u64cd\u4f5c\u7cfb\u7edf\u7a0b\u5e8f\u6b63\u5e38\u7ed3\u675f\u3002<\/li>\n<\/ul>\n<p>C \u6e90\u6587\u4ef6\u4e0d\u4f1a\u88ab\u8ba1\u7b97\u673a\u76f4\u63a5\u6267\u884c\u3002\u7f16\u8bd1\u5668\u4f1a\u5148\u628a\u6e90\u4ee3\u7801\u7ffb\u8bd1\u6210\u76ee\u6807\u4ee3\u7801&#xff0c;\u518d\u7531\u94fe\u63a5\u5668\u628a\u76ee\u6807\u4ee3\u7801\u548c\u5e93\u8fde\u63a5\u8d77\u6765&#xff0c;\u6700\u7ec8\u751f\u6210\u53ef\u6267\u884c\u6587\u4ef6\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260918201952-6aad9ce84cfd5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<h3>2. \u6570\u636e\u7c7b\u578b&#xff1a;\u6570\u636e\u5e94\u8be5\u5982\u4f55\u89e3\u91ca<\/h3>\n<p>\u8ba1\u7b97\u673a\u5185\u5b58\u672c\u8d28\u4e0a\u53ea\u662f\u4e00\u4e32\u5b57\u8282\u3002\u6570\u636e\u7c7b\u578b\u544a\u8bc9\u7f16\u8bd1\u5668&#xff1a;\u8fd9\u4e9b\u5b57\u8282\u4ee3\u8868\u4ec0\u4e48&#xff0c;\u4ee5\u53ca\u8981\u5360\u7528\u591a\u5c11\u7a7a\u95f4\u3002<\/p>\n<p>C \u8bed\u8a00\u5e38\u89c1\u7684\u57fa\u672c\u7c7b\u578b\u5982\u4e0b&#xff1a;<\/p>\n<table>\n<tr>\u7c7b\u578b\u7528\u9014\u5178\u578b\u5927\u5c0f*<\/tr>\n<tbody>\n<tr>\n<td>char<\/td>\n<td>\u5b57\u7b26\u6216\u5c0f\u6574\u6570<\/td>\n<td>1 \u5b57\u8282<\/td>\n<\/tr>\n<tr>\n<td>short<\/td>\n<td>\u77ed\u6574\u578b<\/td>\n<td>2 \u5b57\u8282<\/td>\n<\/tr>\n<tr>\n<td>int<\/td>\n<td>\u5e38\u7528\u6574\u578b<\/td>\n<td>4 \u5b57\u8282<\/td>\n<\/tr>\n<tr>\n<td>long<\/td>\n<td>\u957f\u6574\u578b<\/td>\n<td>4 \u6216 8 \u5b57\u8282<\/td>\n<\/tr>\n<tr>\n<td>long long<\/td>\n<td>\u66f4\u5927\u8303\u56f4\u7684\u6574\u578b<\/td>\n<td>8 \u5b57\u8282<\/td>\n<\/tr>\n<tr>\n<td>float<\/td>\n<td>\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570<\/td>\n<td>4 \u5b57\u8282<\/td>\n<\/tr>\n<tr>\n<td>double<\/td>\n<td>\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570<\/td>\n<td>8 \u5b57\u8282<\/td>\n<\/tr>\n<tr>\n<td>bool<\/td>\n<td>\u771f\u6216\u5047<\/td>\n<td>\u901a\u5e38 1 \u5b57\u8282<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5177\u4f53\u5927\u5c0f\u7531\u7f16\u8bd1\u5668\u548c\u5e73\u53f0\u51b3\u5b9a&#xff0c;32 \u4f4d\u5e73\u53f0\u5c0f\u4e00\u4e9b&#xff08;4 \u5b57\u8282&#xff09;&#xff0c;64 \u4f4d\u5e73\u53f0\u5927\u4e00\u4e9b&#xff08;8 \u5b57\u8282&#xff09;\u3002<\/p>\n<p>\u58f0\u660e\u53d8\u91cf\u65f6&#xff0c;\u9700\u8981\u540c\u65f6\u5199\u51fa\u7c7b\u578b\u548c\u540d\u5b57&#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><\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> ch <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;A&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">double<\/span> price <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1.23<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%c %d %.2f\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> ch<span class=\"token punctuation\">,<\/span> count<span class=\"token punctuation\">,<\/span> price<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;int: %zu bytes\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/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>sizeof \u8ba1\u7b97\u5bf9\u8c61\u6216\u7c7b\u578b\u5360\u7528\u7684\u5b57\u8282\u6570&#xff0c;\u7ed3\u679c\u7c7b\u578b\u662f size_t&#xff0c;\u901a\u5e38\u4f7f\u7528 %zu \u8f93\u51fa\u3002<\/p>\n<p>\u7c7b\u578b\u4e0d\u4ec5\u51b3\u5b9a\u5927\u5c0f&#xff0c;\u4e5f\u51b3\u5b9a\u8fd0\u7b97\u89c4\u5219\u3002\u4f8b\u5982&#xff0c;\u4e24\u4e2a int \u76f8\u9664\u4ecd\u662f\u6574\u6570\u9664\u6cd5&#xff1a;5 \/ 2 \u7684\u7ed3\u679c\u662f 2&#xff1b;\u5982\u679c\u5e0c\u671b\u5f97\u5230\u5c0f\u6570&#xff0c;\u9700\u8981\u8ba9\u81f3\u5c11\u4e00\u4e2a\u64cd\u4f5c\u6570\u53c2\u4e0e\u6d6e\u70b9\u8fd0\u7b97&#xff1a;5.0 \/ 2\u3002<\/p>\n<p>*\u6ce8&#xff1a;\u5728 C99 \u81f3 C17 \u4e2d&#xff0c;\u4f7f\u7528 bool\u3001true \u548c false \u9700\u8981\u5305\u542b\u5934\u6587\u4ef6&#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;stdbool.h&gt;<\/span><\/span><\/p>\n<p>bool finished <span class=\"token operator\">&#061;<\/span> false<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u4e9b\u7248\u672c\u4e2d\u7684 bool \u5b9e\u9645\u4e0a\u7531\u6807\u51c6\u5e93\u6620\u5c04\u5230\u5185\u7f6e\u7c7b\u578b _Bool\u3002\u4ece C23 \u5f00\u59cb&#xff0c;bool\u3001true \u548c false \u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u3002\u65e5\u5e38\u4ee3\u7801\u5199 bool \u5373\u53ef&#xff0c;\u8ba4\u8bc6 _Bool \u662f\u4e3a\u4e86\u80fd\u770b\u61c2\u6807\u51c6\u548c\u65e7\u4ee3\u7801\u3002<\/p>\n<hr \/>\n<h3>3. \u53d8\u91cf\u4e0e\u5e38\u91cf<\/h3>\n<p>\u7a0b\u5e8f\u9700\u8981\u4fdd\u5b58\u6570\u636e\u3002\u6570\u636e\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u6539\u53d8&#xff0c;\u5c31\u7528\u53d8\u91cf&#xff1b;\u4e0d\u5e94\u6539\u53d8\u6216\u5e0c\u671b\u660e\u786e\u8868\u8fbe\u56fa\u5b9a\u542b\u4e49&#xff0c;\u5c31\u7528\u5e38\u91cf\u3002<\/p>\n<h4>3.1 \u53d8\u91cf\u7684\u5b9a\u4e49<\/h4>\n<p><span class=\"token keyword\">int<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">double<\/span> score <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">95.5<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span> grade <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;A&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4e00\u6761\u53d8\u91cf\u5b9a\u4e49\u53ef\u4ee5\u7406\u89e3\u4e3a&#xff1a;\u5411\u7f16\u8bd1\u5668\u7533\u8bf7\u4e00\u5757\u7b26\u5408\u6307\u5b9a\u7c7b\u578b\u7684\u5b58\u50a8\u7a7a\u95f4&#xff0c;\u7ed9\u5b83\u8d77\u4e00\u4e2a\u540d\u5b57&#xff0c;\u5e76\u5728\u9700\u8981\u65f6\u5199\u5165\u521d\u59cb\u503c\u3002<\/p>\n<p>\u5b9a\u4e49\u4f46\u6ca1\u6709\u521d\u59cb\u5316\u7684\u5c40\u90e8\u53d8\u91cf&#xff0c;\u5176\u503c\u662f\u4e0d\u786e\u5b9a\u7684&#xff0c;\u4f7f\u7528\u524d\u5fc5\u987b\u5148\u8d4b\u503c&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> n<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u4e0d\u8981\u76f4\u63a5\u8bfb\u53d6 n<\/span><br \/>\nn <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u5148\u8d4b\u503c&#xff0c;\u518d\u4f7f\u7528<\/span><\/p>\n<h4>3.2 \u5c40\u90e8\u53d8\u91cf\u4e0e\u5168\u5c40\u53d8\u91cf<\/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> value <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u5168\u5c40\u53d8\u91cf<\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> value <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">300<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u5c40\u90e8\u53d8\u91cf&#xff0c;\u4e0e\u5168\u5c40\u53d8\u91cf\u540c\u540d<\/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> value<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\u662f 300\u3002\u5f53\u5c40\u90e8\u53d8\u91cf\u548c\u5168\u5c40\u53d8\u91cf\u540c\u540d\u65f6&#xff0c;\u5728\u8be5\u5c40\u90e8\u4f5c\u7528\u57df\u5185&#xff0c;\u5c40\u90e8\u53d8\u91cf\u4f1a\u906e\u853d\u5168\u5c40\u53d8\u91cf\u3002<\/p>\n<h4>3.3 \u4f5c\u7528\u57df\u4e0e\u751f\u547d\u5468\u671f<\/h4>\n<ul>\n<li>\u4f5c\u7528\u57df&#xff1a;\u540d\u5b57\u53ef\u4ee5\u88ab\u4f7f\u7528\u7684\u4ee3\u7801\u8303\u56f4\u3002\u5757\u5185\u5b9a\u4e49\u7684\u5c40\u90e8\u53d8\u91cf\u901a\u5e38\u53ea\u5728\u8be5\u5757\u4e2d\u53ef\u89c1&#xff1b;\u666e\u901a\u5168\u5c40\u53d8\u91cf\u4ece\u5b9a\u4e49\u5904\u5f00\u59cb&#xff0c;\u5728\u6574\u4e2a\u6e90\u6587\u4ef6\u53ef\u89c1&#xff0c;\u4e5f\u53ef\u4ee5\u901a\u8fc7 extern \u8de8\u6587\u4ef6\u58f0\u660e\u3002<\/li>\n<li>\u751f\u547d\u5468\u671f&#xff1a;\u5bf9\u8c61\u5b9e\u9645\u5b58\u5728\u7684\u65f6\u95f4\u3002\u666e\u901a\u5c40\u90e8\u53d8\u91cf\u8fdb\u5165\u4ee3\u7801\u5757\u65f6\u521b\u5efa&#xff0c;\u79bb\u5f00\u4ee3\u7801\u5757\u65f6\u9500\u6bc1&#xff1b;\u5168\u5c40\u53d8\u91cf\u4ece\u7a0b\u5e8f\u542f\u52a8\u4e00\u76f4\u5b58\u5728\u5230\u7a0b\u5e8f\u7ed3\u675f\u3002<\/li>\n<\/ul>\n<h4>3.4 \u4f7f\u7528\u8f93\u5165\u8f93\u51fa<\/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\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <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> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u4e24\u4e2a\u6574\u6570&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">scanf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d %d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">2<\/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 &#043; %d &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> a <span class=\"token operator\">&#043;<\/span> b<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 number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>printf \u8d1f\u8d23\u8f93\u51fa&#xff0c;scanf \u8d1f\u8d23\u8f93\u5165\u3002scanf \u9700\u8981\u628a\u8f93\u5165\u7ed3\u679c\u5199\u5165\u53d8\u91cf&#xff0c;\u6240\u4ee5\u8981\u4f20\u5165\u53d8\u91cf\u7684\u5730\u5740&#xff1a;&amp;a\u3001&amp;b\u3002\u5173\u4e8e\u5730\u5740\u548c\u6307\u9488&#xff0c;\u540e\u6587\u4f1a\u8be6\u7ec6\u89e3\u91ca\u3002<\/p>\n<h4>3.5 \u5e38\u91cf<\/h4>\n<p>C \u4e2d\u5e38\u89c1\u7684\u201c\u56fa\u5b9a\u503c\u201d\u6709\u56db\u79cd\u5f62\u5f0f&#xff1a;<\/p>\n<p><span class=\"token number\">10<\/span>                  <span class=\"token comment\">\/\/ \u5b57\u9762\u5e38\u91cf<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span> days <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ const \u5bf9\u8c61&#xff1a;\u4e0d\u80fd\u901a\u8fc7 days \u4fee\u6539<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">MAX<\/span> <span class=\"token expression\"><span class=\"token number\">100<\/span>     <\/span><span class=\"token comment\">\/\/ \u5b8f\u5e38\u91cf&#xff1a;\u9884\u5904\u7406\u9636\u6bb5\u8fdb\u884c\u6587\u672c\u66ff\u6362<\/span><\/span><br \/>\n<span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">color<\/span> <span class=\"token punctuation\">{<\/span> RED<span class=\"token punctuation\">,<\/span> GREEN<span class=\"token punctuation\">,<\/span> BLUE <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u679a\u4e3e\u5e38\u91cf<\/span><\/p>\n<p>const \u8868\u793a\u901a\u8fc7\u8fd9\u4e2a\u540d\u5b57\u4e0d\u80fd\u4fee\u6539\u5bf9\u8c61&#xff0c;\u4f46\u5b83\u4e0d\u7b49\u540c\u4e8e C&#043;&#043; \u610f\u4e49\u4e0a\u7684\u7f16\u8bd1\u671f\u5e38\u91cf&#xff1b;\u9700\u8981\u9884\u5904\u7406\u66ff\u6362\u65f6\u624d\u4f7f\u7528 #define&#xff0c;\u5e76\u6ce8\u610f\u5b8f\u6ca1\u6709\u7c7b\u578b\u68c0\u67e5\u3002<\/p>\n<hr \/>\n<h3>4. \u5b57\u7b26\u3001\u5b57\u7b26\u4e32\u4e0e\u8f6c\u4e49\u5b57\u7b26<\/h3>\n<h4>4.1 \u5b57\u7b26\u4e0e\u5b57\u7b26\u4e32<\/h4>\n<p>\u5b57\u7b26\u5e38\u91cf\u7528\u5355\u5f15\u53f7\u8868\u793a&#xff0c;\u4f8b\u5982 &#039;A&#039;&#xff1b;\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u7528\u53cc\u5f15\u53f7\u8868\u793a&#xff0c;\u4f8b\u5982 &#034;Hello&#034;\u3002<\/p>\n<p>C \u6ca1\u6709\u72ec\u7acb\u7684\u5b57\u7b26\u4e32\u7c7b\u578b\u3002\u5b57\u7b26\u4e32\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u4ee5\u7a7a\u5b57\u7b26 \\\\0 \u7ed3\u5c3e\u7684 char \u6570\u7ec4&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span> text<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><\/p>\n<p>\u5185\u5b58\u4e2d\u5b9e\u9645\u5b58\u653e\u7684\u662f 6 \u4e2a\u5b57\u7b26&#xff1a;H\u3001e\u3001l\u3001l\u3001o\u3001\\\\0\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260918201952-6aad9ce886bd0.png\" alt=\"!c-string-memory.svg\" \/><\/p>\n<p>\u5982\u679c\u6ca1\u6709 \\\\0&#xff0c;\u50cf printf(&#034;%s&#034;, text) \u8fd9\u6837\u7684\u5b57\u7b26\u4e32\u51fd\u6570\u5c31\u4e0d\u77e5\u9053\u5e94\u8be5\u5728\u54ea\u91cc\u505c\u6b62\u8bfb\u53d6\u3002<\/p>\n<h4>4.2 \u8f6c\u4e49\u5b57\u7b26<\/h4>\n<p>\u53cd\u659c\u6760 \\\\ \u5f15\u51fa\u8f6c\u4e49\u5b57\u7b26&#xff0c;\u7528\u6765\u8868\u793a\u6362\u884c\u3001\u5236\u8868\u6216\u6e90\u4ee3\u7801\u4e2d\u4e0d\u65b9\u4fbf\u76f4\u63a5\u5199\u51fa\u7684\u5b57\u7b26\u3002<\/p>\n<p><span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Hello\\\\nWorld\\\\n&#034;<\/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;A\\\\tB\\\\n&#034;<\/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;c:\\\\\\\\code\\\\\\\\test.c\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8f93\u51fa\u76ee\u5f55\u65f6\u5fc5\u987b\u628a\u53cd\u659c\u6760\u5199\u6210 \\\\\\\\\u3002\u5426\u5219&#xff0c;\\\\t \u4f1a\u88ab\u89e3\u91ca\u4e3a\u5236\u8868\u7b26&#xff1a;<\/p>\n<p><span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;c:\\\\code\\\\test.c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u9519\u8bef\u793a\u4f8b&#xff1a;\\\\t \u4f1a\u53d8\u6210 Tab<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;c:\\\\\\\\code\\\\\\\\test.c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6b63\u786e<\/span><\/p>\n<p>\u5e38\u7528\u8f6c\u4e49\u5b57\u7b26&#xff1a;<\/p>\n<table>\n<tr>\u5199\u6cd5\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td>\\\\0<\/td>\n<td>\u7a7a\u5b57\u7b26&#xff0c;\u5b57\u7b26\u4e32\u7ed3\u675f\u6807\u5fd7<\/td>\n<\/tr>\n<tr>\n<td>\\\\n<\/td>\n<td>\u6362\u884c<\/td>\n<\/tr>\n<tr>\n<td>\\\\t<\/td>\n<td>\u6c34\u5e73\u5236\u8868\u7b26<\/td>\n<\/tr>\n<tr>\n<td>\\\\\\\\<\/td>\n<td>\u53cd\u659c\u6760<\/td>\n<\/tr>\n<tr>\n<td>\\\\&#034;<\/td>\n<td>\u53cc\u5f15\u53f7<\/td>\n<\/tr>\n<tr>\n<td>\\\\&#039;<\/td>\n<td>\u5355\u5f15\u53f7<\/td>\n<\/tr>\n<tr>\n<td>\\\\r<\/td>\n<td>\u56de\u8f66&#xff0c;\u5c06\u5149\u6807\u79fb\u5230\u5f53\u524d\u884c\u5f00\u5934<\/td>\n<\/tr>\n<tr>\n<td>\\\\b<\/td>\n<td>\u9000\u683c<\/td>\n<\/tr>\n<tr>\n<td>\\\\a<\/td>\n<td>\u54cd\u94c3&#xff08;\u662f\u5426\u6709\u58f0\u97f3\u53d6\u51b3\u4e8e\u7ec8\u7aef&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>C \u8fd8\u652f\u6301\u516b\u8fdb\u5236 \\\\ooo \u548c\u5341\u516d\u8fdb\u5236 \\\\xhh \u8868\u793a\u5b57\u7b26&#xff0c;\u4f8b\u5982 \\\\x41 \u8868\u793a\u5b57\u7b26 A\u3002<\/p>\n<h4>4.3 \u6ce8\u91ca<\/h4>\n<p>\u6ce8\u91ca\u53ea\u7ed9\u4eba\u9605\u8bfb&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u5ffd\u7565\u5b83\u4eec&#xff1a;<\/p>\n<p><span class=\"token comment\">\/* C \u98ce\u683c\u6ce8\u91ca&#xff0c;\u53ef\u4ee5\u8de8\u591a\u884c *\/<\/span><br \/>\n<span class=\"token comment\">\/\/ C99 \u53ca\u4e4b\u540e\u652f\u6301\u7684\u5355\u884c\u6ce8\u91ca<\/span><\/p>\n<hr \/>\n<h3>5. \u9009\u62e9\u8bed\u53e5&#xff1a;\u6839\u636e\u6761\u4ef6\u51b3\u5b9a\u8def\u5f84<\/h3>\n<p>C \u4e2d&#xff0c;\u6761\u4ef6\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u4e3a 0 \u65f6\u8868\u793a\u5047&#xff0c;\u975e 0 \u65f6\u8868\u793a\u771f\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;stdio.h&gt;<\/span><\/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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> score <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">85<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>score <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">60<\/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;\u53ca\u683c\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><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;\u4e0d\u53ca\u683c\\\\n&#034;<\/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 number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>if \u5148\u8ba1\u7b97\u6761\u4ef6&#xff0c;\u518d\u6267\u884c\u4e00\u4e2a\u5206\u652f\u3002else if \u53ef\u4ee5\u7ee7\u7eed\u6dfb\u52a0\u6761\u4ef6&#xff1a;<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>score <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">90<\/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;A\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>score <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">60<\/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;B\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><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;C\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5f53\u8981\u6839\u636e\u540c\u4e00\u4e2a\u8868\u8fbe\u5f0f\u5339\u914d\u591a\u4e2a\u56fa\u5b9a\u503c\u65f6&#xff0c;\u53ef\u4ee5\u4f7f\u7528 switch&#xff1a;<\/p>\n<p><span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>choice<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">case<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5f00\u59cb\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">case<\/span> <span class=\"token number\">2<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u9000\u51fa\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u672a\u77e5\u9009\u9879\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>break \u7528\u6765\u7ed3\u675f\u5f53\u524d switch\u3002\u5982\u679c\u7701\u7565\u5b83&#xff0c;\u7a0b\u5e8f\u4f1a\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u4e2a case&#xff0c;\u8fd9\u53eb\u201c\u8d2f\u7a7f\u201d\u3002<\/p>\n<hr \/>\n<h3>6. \u5faa\u73af\u8bed\u53e5&#xff1a;\u91cd\u590d\u6267\u884c\u4e00\u6bb5\u4ee3\u7801<\/h3>\n<p>\u5faa\u73af\u7684\u6838\u5fc3\u662f&#xff1a;\u5148\u5224\u65ad\u662f\u5426\u6ee1\u8db3\u6761\u4ef6&#xff0c;\u6ee1\u8db3\u5c31\u6267\u884c\u4e00\u6b21&#xff0c;\u518d\u56de\u5230\u5224\u65ad\u5904\u3002<\/p>\n<h4>6.1 while<\/h4>\n<p><span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>count <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">10<\/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> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>while \u5148\u5224\u65ad\u6761\u4ef6&#xff0c;\u56e0\u6b64\u4e00\u6b21\u4e5f\u53ef\u80fd\u4e0d\u6267\u884c\u3002<\/p>\n<h4>6.2 for<\/h4>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> count <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span> count<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> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>for \u628a\u521d\u59cb\u5316\u3001\u6761\u4ef6\u548c\u8fed\u4ee3\u5199\u5728\u4e00\u884c&#xff0c;\u9002\u5408\u8ba1\u6570\u5faa\u73af\u3002\u4e0a\u9762\u7684\u4ee3\u7801\u7b49\u4ef7\u4e8e&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>count <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">10<\/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> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>6.3 do&#8230;while<\/h4>\n<p><span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">do<\/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> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>count <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>do&#8230;while \u5148\u6267\u884c\u4e00\u6b21&#xff0c;\u518d\u5224\u65ad\u6761\u4ef6&#xff0c;\u56e0\u6b64\u81f3\u5c11\u6267\u884c\u4e00\u6b21\u3002\u6ce8\u610f\u7ed3\u5c3e\u7684\u5206\u53f7\u4e0d\u80fd\u7701\u7565\u3002<\/p>\n<p>\u5faa\u73af\u4e2d\u8fd8\u5e38\u7528\u4e24\u4e2a\u63a7\u5236\u8bed\u53e5&#xff1a;<\/p>\n<ul>\n<li>break&#xff1a;\u7acb\u5373\u7ed3\u675f\u5f53\u524d\u5faa\u73af\u3002<\/li>\n<li>continue&#xff1a;\u8df3\u8fc7\u672c\u8f6e\u5269\u4f59\u4ee3\u7801&#xff0c;\u8fdb\u5165\u4e0b\u4e00\u8f6e\u5224\u65ad\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>7. \u51fd\u6570&#xff1a;\u7ed9\u4e00\u6bb5\u64cd\u4f5c\u547d\u540d<\/h3>\n<p>\u51fd\u6570\u662f\u5b8c\u6210\u7279\u5b9a\u4efb\u52a1\u7684\u4e00\u6bb5\u4ee3\u7801\u3002\u5b83\u53ef\u4ee5\u63a5\u6536\u8f93\u5165&#xff08;\u53c2\u6570&#xff09;&#xff0c;\u7ecf\u8fc7\u5904\u7406\u540e\u8fd4\u56de\u7ed3\u679c&#xff0c;\u4ece\u800c\u907f\u514d\u91cd\u590d\u7f16\u5199\u76f8\u540c\u903b\u8f91\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;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> x<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> y<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> x <span class=\"token operator\">&#043;<\/span> y<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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> x <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> y <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u4e24\u4e2a\u6574\u6570&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">scanf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d %d&#034;<\/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 punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7ed3\u679c&#xff1a;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">)<\/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>\u51fd\u6570\u5b9a\u4e49\u5305\u542b\u8fd4\u56de\u7c7b\u578b\u3001\u51fd\u6570\u540d\u3001\u53c2\u6570\u5217\u8868\u548c\u51fd\u6570\u4f53\u3002\u5982\u679c\u51fd\u6570\u5b9a\u4e49\u5199\u5728\u8c03\u7528\u4e4b\u540e&#xff0c;\u9700\u8981\u5148\u58f0\u660e\u51fd\u6570\u539f\u578b&#xff1a;<\/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> x<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u51fd\u6570\u58f0\u660e<\/span><\/p>\n<p>C \u7684\u53c2\u6570\u4f20\u9012\u9ed8\u8ba4\u662f\u503c\u4f20\u9012&#xff1a;\u8c03\u7528\u51fd\u6570\u65f6&#xff0c;\u5b9e\u53c2\u7684\u503c\u4f1a\u590d\u5236\u7ed9\u5f62\u53c2\u3002\u51fd\u6570\u5185\u4fee\u6539\u5f62\u53c2&#xff0c;\u4e0d\u4f1a\u6539\u53d8\u8c03\u7528\u8005\u7684\u53d8\u91cf&#xff1b;\u5982\u679c\u8981\u4fee\u6539\u8c03\u7528\u8005\u7684\u53d8\u91cf&#xff0c;\u9700\u8981\u4f20\u9012\u5730\u5740&#xff0c;\u8fd9\u6b63\u662f\u6307\u9488\u7684\u7528\u9014\u3002<\/p>\n<hr \/>\n<h3>8. \u6570\u7ec4&#xff1a;\u8fde\u7eed\u5b58\u653e\u540c\u7c7b\u578b\u6570\u636e<\/h3>\n<p>\u6570\u7ec4\u662f\u4e00\u7ec4\u7c7b\u578b\u76f8\u540c\u3001\u5728\u5185\u5b58\u4e2d\u8fde\u7eed\u5b58\u653e\u7684\u5143\u7d20\u3002\u6570\u7ec4\u957f\u5ea6\u5728\u5b9a\u4e49\u65f6\u786e\u5b9a&#xff0c;\u5143\u7d20\u4e0b\u6807\u4ece 0 \u5f00\u59cb\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> nums<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><\/p>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/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    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;nums[%d] &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">,<\/span> nums<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>\u5982\u679c\u521d\u59cb\u5316\u5217\u8868\u5c11\u4e8e\u6570\u7ec4\u957f\u5ea6&#xff0c;\u5269\u4f59\u5143\u7d20\u4f1a\u88ab\u521d\u59cb\u5316\u4e3a 0&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> nums<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 punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5b9e\u9645\u4e3a {1, 2, 0, 0, 0}<\/span><\/p>\n<p>\u8bbf\u95ee\u8d8a\u754c\u4e0d\u4f1a\u81ea\u52a8\u62a5\u9519&#xff0c;\u7ed3\u679c\u662f\u672a\u5b9a\u4e49\u884c\u4e3a\u3002\u6570\u7ec4\u957f\u5ea6\u5fc5\u987b\u7531\u7a0b\u5e8f\u5458\u4fdd\u8bc1\u3002<\/p>\n<p>\u5728\u6570\u7ec4\u4ecd\u662f\u6570\u7ec4\u7684\u4f5c\u7528\u57df\u5185&#xff0c;\u53ef\u4ee5\u7528\u4e0b\u9762\u7684\u65b9\u5f0f\u8ba1\u7b97\u5143\u7d20\u4e2a\u6570&#xff1a;<\/p>\n<p><span class=\"token class-name\">size_t<\/span> length <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span> nums <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">sizeof<\/span> nums<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6570\u7ec4\u4f5c\u4e3a\u51fd\u6570\u53c2\u6570\u65f6\u4f1a\u9000\u5316\u4e3a\u6307\u9488&#xff0c;\u6b64\u65f6 sizeof \u5f97\u5230\u7684\u662f\u6307\u9488\u5927\u5c0f&#xff0c;\u4e0d\u80fd\u518d\u7528\u4e0a\u9762\u7684\u516c\u5f0f\u8ba1\u7b97\u957f\u5ea6&#xff0c;\u901a\u5e38\u9700\u8981\u989d\u5916\u4f20\u5165\u957f\u5ea6\u3002<\/p>\n<hr \/>\n<h3>9. \u64cd\u4f5c\u7b26&#xff1a;\u5bf9\u6570\u636e\u6267\u884c\u64cd\u4f5c<\/h3>\n<p>\u64cd\u4f5c\u7b26\u8fde\u63a5\u4e00\u4e2a\u6216\u591a\u4e2a\u64cd\u4f5c\u6570&#xff0c;\u4ea7\u751f\u4e00\u4e2a\u7ed3\u679c&#xff0c;\u6216\u6539\u53d8\u5bf9\u8c61\u7684\u503c\u3002<\/p>\n<table>\n<tr>\u7c7b\u522b\u64cd\u4f5c\u7b26\u4f5c\u7528\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td>\u7b97\u672f<\/td>\n<td>&#043; &#8211; * \/ %<\/td>\n<td>\u52a0\u3001\u51cf\u3001\u4e58\u3001\u9664\u3001\u53d6\u4f59<\/td>\n<td>a &#043; b<\/td>\n<\/tr>\n<tr>\n<td>\u81ea\u589e\u81ea\u51cf<\/td>\n<td>&#043;&#043; &#8212;<\/td>\n<td>\u52a0\u4e00\u3001\u51cf\u4e00<\/td>\n<td>i&#043;&#043;<\/td>\n<\/tr>\n<tr>\n<td>\u5173\u7cfb<\/td>\n<td>&lt; &lt;&#061; &gt; &gt;&#061; &#061;&#061; !&#061;<\/td>\n<td>\u6bd4\u8f83\u5927\u5c0f\u6216\u76f8\u7b49<\/td>\n<td>a &#061;&#061; b<\/td>\n<\/tr>\n<tr>\n<td>\u903b\u8f91<\/td>\n<td>&#096;&amp;&amp;<\/td>\n<td><\/td>\n<td>!&#096;<\/td>\n<\/tr>\n<tr>\n<td>\u4f4d\u8fd0\u7b97<\/td>\n<td>&#096;&amp;<\/td>\n<td>^ ~ &lt;&lt; &gt;&gt;&#096;<\/td>\n<td>\u6309\u4f4d\u4e0e\u3001\u6216\u3001\u5f02\u6216\u3001\u53d6\u53cd\u3001\u79fb\u4f4d<\/td>\n<\/tr>\n<tr>\n<td>\u8d4b\u503c<\/td>\n<td>&#061; &#043;&#061; -&#061; *&#061; \/&#061; %&#061; &#8230;<\/td>\n<td>\u7ed9\u53d8\u91cf\u8d4b\u503c<\/td>\n<td>a &#043;&#061; 1<\/td>\n<\/tr>\n<tr>\n<td>\u6307\u9488<\/td>\n<td>&amp; *<\/td>\n<td>\u53d6\u5730\u5740\u3001\u89e3\u5f15\u7528<\/td>\n<td>&amp;a\u3001*p<\/td>\n<\/tr>\n<tr>\n<td>\u6210\u5458\u8bbf\u95ee<\/td>\n<td>. -&gt;<\/td>\n<td>\u8bbf\u95ee\u7ed3\u6784\u4f53\u6210\u5458<\/td>\n<td>s.age\u3001p-&gt;age<\/td>\n<\/tr>\n<tr>\n<td>\u4e0b\u6807\u4e0e\u8c03\u7528<\/td>\n<td>[] ()<\/td>\n<td>\u8bbf\u95ee\u6570\u7ec4\u3001\u8c03\u7528\u51fd\u6570<\/td>\n<td>arr[i]\u3001f()<\/td>\n<\/tr>\n<tr>\n<td>\u6761\u4ef6<\/td>\n<td>?:<\/td>\n<td>\u6839\u636e\u6761\u4ef6\u8fd4\u56de\u4e24\u4e2a\u7ed3\u679c\u4e4b\u4e00<\/td>\n<td>a &gt; b ? a : b<\/td>\n<\/tr>\n<tr>\n<td>\u5176\u4ed6<\/td>\n<td>sizeof\u3001(type)\u3001,<\/td>\n<td>\u6c42\u5927\u5c0f\u3001\u7c7b\u578b\u8f6c\u6362\u3001\u9017\u53f7\u8868\u8fbe\u5f0f<\/td>\n<td>sizeof(int)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>9.1 \u6700\u5bb9\u6613\u6df7\u6dc6\u7684\u7b26\u53f7<\/h4>\n<ul>\n<li>&#061; \u662f\u8d4b\u503c&#xff0c;&#061;&#061; \u662f\u6bd4\u8f83&#xff1a;a &#061; 3 \u628a 3 \u5199\u5165 a&#xff0c;a &#061;&#061; 3 \u5224\u65ad a \u662f\u5426\u4e3a 3\u3002<\/li>\n<li>&amp; \u53ef\u80fd\u8868\u793a\u6309\u4f4d\u4e0e&#xff0c;\u4e5f\u53ef\u80fd\u8868\u793a\u53d6\u5730\u5740&#xff0c;\u8981\u770b\u4e0a\u4e0b\u6587&#xff1a;a &amp; b \u662f\u6309\u4f4d\u4e0e&#xff0c;&amp;a \u662f\u53d6\u5730\u5740\u3002<\/li>\n<li>\u53ef\u80fd\u8868\u793a\u4e58\u6cd5\u3001\u58f0\u660e\u6307\u9488\u6216\u89e3\u5f15\u7528&#xff1a;a * b\u3001int *p\u3001*p\u3002<\/li>\n<li>| \u662f\u6309\u4f4d\u6216&#xff0c;|| \u662f\u903b\u8f91\u6216&#xff1b;&amp; \u662f\u6309\u4f4d\u4e0e&#xff0c;&amp;&amp; \u662f\u903b\u8f91\u4e0e\u3002<\/li>\n<\/ul>\n<h4>9.2 \u4f18\u5148\u7ea7<\/h4>\n<p>\u5e38\u89c1\u4f18\u5148\u7ea7\u4ece\u9ad8\u5230\u4f4e\u5927\u81f4\u662f&#xff1a;<\/p>\n<li>()\u3001[]\u3001.\u3001&gt;<\/li>\n<li>\u4e00\u5143\u8fd0\u7b97\u7b26&#xff1a;!\u3001~\u3001&#043;&#043;\u3001-\u3001&amp;\u3001\u3001sizeof<\/li>\n<li>\u3001\/\u3001%<\/li>\n<li>&#043;\u3001<\/li>\n<li>\u79fb\u4f4d&#xff1a;&lt;&lt;\u3001&gt;&gt;<\/li>\n<li>\u5173\u7cfb\u6bd4\u8f83\u4e0e\u76f8\u7b49\u6bd4\u8f83<\/li>\n<li>\u4f4d\u8fd0\u7b97&#xff1a;&amp;\u3001^\u3001|<\/li>\n<li>\u903b\u8f91\u8fd0\u7b97&#xff1a;&amp;&amp;\u3001||<\/li>\n<li>?:<\/li>\n<li>\u8d4b\u503c\u8fd0\u7b97\u7b26<\/li>\n<li>,<\/li>\n<p>\u4e0d\u786e\u5b9a\u4f18\u5148\u7ea7\u65f6&#xff0c;\u76f4\u63a5\u52a0\u62ec\u53f7\u3002\u62ec\u53f7\u4e0d\u4ec5\u80fd\u6539\u53d8\u6c42\u503c\u987a\u5e8f&#xff0c;\u4e5f\u80fd\u8ba9\u4ee3\u7801\u66f4\u5bb9\u6613\u9605\u8bfb\u3002<\/p>\n<hr \/>\n<h3>10. \u5173\u952e\u5b57<\/h3>\n<p>\u5173\u952e\u5b57\u662f C \u8bed\u8a00\u4fdd\u7559\u7684\u5355\u8bcd&#xff0c;\u4e0d\u80fd\u7528\u4f5c\u53d8\u91cf\u540d\u3001\u51fd\u6570\u540d\u6216\u7ed3\u6784\u4f53\u6210\u5458\u540d\u3002\u5e38\u89c1\u5173\u952e\u5b57\u6309\u7528\u9014\u53ef\u4ee5\u5206\u4e3a&#xff1a;<\/p>\n<table>\n<tr>\u7c7b\u522b\u5173\u952e\u5b57<\/tr>\n<tbody>\n<tr>\n<td>\u7c7b\u578b<\/td>\n<td>char\u3001short\u3001int\u3001long\u3001float\u3001double\u3001void\u3001signed\u3001unsigned\u3001struct\u3001union\u3001enum<\/td>\n<\/tr>\n<tr>\n<td>\u6d41\u7a0b\u63a7\u5236<\/td>\n<td>if\u3001else\u3001switch\u3001case\u3001default\u3001for\u3001while\u3001do\u3001break\u3001continue\u3001goto\u3001return<\/td>\n<\/tr>\n<tr>\n<td>\u5b58\u50a8\u4e0e\u94fe\u63a5<\/td>\n<td>auto\u3001register\u3001static\u3001extern<\/td>\n<\/tr>\n<tr>\n<td>\u7c7b\u578b\u4e0e\u9650\u5b9a<\/td>\n<td>const\u3001volatile\u3001sizeof\u3001typedef<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e0d\u540c C \u6807\u51c6\u5b9a\u4e49\u7684\u5173\u952e\u5b57\u7565\u6709\u5dee\u5f02&#xff0c;\u4f8b\u5982 C99 \u5f15\u5165\u4e86 _Bool\u3001inline \u548c restrict&#xff0c;C23 \u53c8\u5c06 bool\u3001true \u548c false \u7eb3\u5165\u8bed\u8a00\u3002\u5b9e\u9645\u7f16\u7a0b\u65f6&#xff0c;\u4f18\u5148\u638c\u63e1\u4e0a\u8868&#xff0c;\u518d\u6839\u636e\u9879\u76ee\u91c7\u7528\u7684 C \u6807\u51c6\u67e5\u9605\u5b8c\u6574\u5217\u8868\u3002<\/p>\n<h4>10.1 static&#xff1a;\u6539\u53d8\u751f\u547d\u5468\u671f\u6216\u53ef\u89c1\u8303\u56f4<\/h4>\n<p>static \u653e\u5728\u4e0d\u540c\u4f4d\u7f6e&#xff0c;\u542b\u4e49\u4e0d\u540c\u3002<\/p>\n<table>\n<tr>\u4f7f\u7528\u4f4d\u7f6e\u4f5c\u7528<\/tr>\n<tbody>\n<tr>\n<td>\u5c40\u90e8\u53d8\u91cf\u524d<\/td>\n<td>\u751f\u547d\u5468\u671f\u5ef6\u957f\u5230\u6574\u4e2a\u7a0b\u5e8f\u7ed3\u675f&#xff0c;\u4f46\u4f5c\u7528\u57df\u4e0d\u53d8<\/td>\n<\/tr>\n<tr>\n<td>\u5168\u5c40\u53d8\u91cf\u524d<\/td>\n<td>\u53ea\u5141\u8bb8\u5f53\u524d\u6e90\u6587\u4ef6\u8bbf\u95ee&#xff08;\u5185\u90e8\u94fe\u63a5&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u51fd\u6570\u5b9a\u4e49\u524d<\/td>\n<td>\u53ea\u5141\u8bb8\u5f53\u524d\u6e90\u6587\u4ef6\u8c03\u7528&#xff08;\u5185\u90e8\u94fe\u63a5&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5>static \u4fee\u9970\u5c40\u90e8\u53d8\u91cf<\/h5>\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\">void<\/span> <span class=\"token function\">normal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;normal: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#043;&#043;<\/span>count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">persistent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;static: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#043;&#043;<\/span>count<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> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">normal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token function\">normal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token function\">normal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">persistent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token function\">persistent<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token function\">persistent<\/span><span class=\"token punctuation\">(<\/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>language<span class=\"token operator\">\/<\/span>c<span class=\"token operator\">\/<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&#8211;<\/span>intro &#xf02a2; master <span class=\"token operator\">!<\/span><span class=\"token operator\">?<\/span> \u276f <span class=\"token punctuation\">.<\/span><span class=\"token operator\">\/<\/span>main<br \/>\nnormal<span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><br \/>\nnormal<span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><br \/>\nnormal<span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><br \/>\n<span class=\"token keyword\">static<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><br \/>\n<span class=\"token keyword\">static<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">2<\/span><br \/>\n<span class=\"token keyword\">static<\/span><span class=\"token operator\">:<\/span> <span class=\"token number\">3<\/span><\/p>\n<p>\u8f93\u51fa\u4e2d&#xff0c;normal \u6bcf\u6b21\u90fd\u662f 1&#xff1b;persistent \u4f9d\u6b21\u662f 1\u30012\u30013\u3002\u9759\u6001\u5c40\u90e8\u53d8\u91cf\u53ea\u521d\u59cb\u5316\u4e00\u6b21&#xff0c;\u4e4b\u540e\u4fdd\u7559\u4e0a\u4e00\u6b21\u8c03\u7528\u7ed3\u675f\u65f6\u7684\u503c\u3002\u9759\u6001\u5b58\u50a8\u671f\u5bf9\u8c61\u5982\u679c\u6ca1\u6709\u663e\u5f0f\u521d\u59cb\u5316&#xff0c;\u9ed8\u8ba4\u521d\u59cb\u5316\u4e3a 0\u3002<\/p>\n<h5>static \u4fee\u9970\u5168\u5c40\u53d8\u91cf\u6216\u51fd\u6570<\/h5>\n<p>\u5148\u770b\u4e00\u4e2a\u53ef\u4ee5\u6b63\u5e38\u8de8\u6587\u4ef6\u8bbf\u95ee\u7684\u4f8b\u5b50\u3002\u4e0b\u9762\u662f\u4e24\u4e2a\u6e90\u6587\u4ef6&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ counter.c<\/span><br \/>\n<span class=\"token keyword\">int<\/span> g_count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">reset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> g_count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ main.c<\/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;stdio.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">extern<\/span> <span class=\"token keyword\">int<\/span> g_count<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">reset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><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> <span class=\"token punctuation\">{<\/span><br \/>\n    g_count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">42<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">reset<\/span><span class=\"token punctuation\">(<\/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;g_count &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> g_count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 0<\/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>\u7f16\u8bd1\u65f6\u628a\u4e24\u4e2a\u6e90\u6587\u4ef6\u4e00\u8d77\u4ea4\u7ed9\u7f16\u8bd1\u5668&#xff1a;<\/p>\n<p>cc counter.c main.c <span class=\"token parameter variable\">-o<\/span> demo<\/p>\n<p>\u8fd9\u91cc\u7684 g_count \u548c reset \u90fd\u5177\u6709\u5916\u90e8\u94fe\u63a5&#xff0c;main.c \u53ef\u4ee5\u901a\u8fc7\u58f0\u660e\u4f7f\u7528\u5b83\u4eec\u3002<\/p>\n<p>\u5982\u679c\u628a counter.c \u4e2d\u7684\u53d8\u91cf\u6539\u6210 static&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ counter.c<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> g_count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">reset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    g_count <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>\u6b64\u65f6 g_count \u53ea\u5728 counter.c \u5185\u53ef\u89c1\u3002reset \u4ecd\u7136\u53ef\u4ee5\u88ab\u5176\u4ed6\u6587\u4ef6\u8c03\u7528&#xff0c;\u4f46 main.c \u4e2d\u7684 extern int g_count; \u5c06\u65e0\u6cd5\u94fe\u63a5\u5230\u5b83\u3002\u901a\u5e38\u7684\u505a\u6cd5\u662f&#xff1a;\u628a\u6570\u636e\u8bbe\u4e3a static&#xff0c;\u53ea\u5bf9\u5916\u63d0\u4f9b\u64cd\u4f5c\u6570\u636e\u7684\u51fd\u6570\u3002<\/p>\n<p>\u540c\u7406&#xff0c;\u5982\u679c\u628a\u51fd\u6570\u5b9a\u4e49\u4e3a static&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ counter.c<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">reset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/* \u53ea\u80fd\u5728 counter.c \u4e2d\u8c03\u7528 *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u90a3\u4e48 main.c \u5373\u4f7f\u5199\u51fa void reset(void);&#xff0c;\u8c03\u7528\u65f6\u4e5f\u4f1a\u5728\u94fe\u63a5\u9636\u6bb5\u62a5\u201c\u672a\u5b9a\u4e49\u5f15\u7528\u201d\u3002<\/p>\n<p>\u56e0\u6b64&#xff0c;\u6587\u4ef6\u4f5c\u7528\u57df\u7684 static \u5e76\u4e0d\u662f\u6539\u53d8\u53d8\u91cf\u7684\u751f\u547d\u5468\u671f&#xff0c;\u800c\u662f\u628a\u53d8\u91cf\u6216\u51fd\u6570\u7684\u94fe\u63a5\u5c5e\u6027\u6539\u4e3a\u201c\u4ec5\u5f53\u524d\u6e90\u6587\u4ef6\u53ef\u89c1\u201d\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260918201952-6aad9ce8c4b9f.png\" alt=\"!c-static-linkage.svg\" \/><\/p>\n<hr \/>\n<h3>11. #define&#xff1a;\u9884\u5904\u7406\u9636\u6bb5\u7684\u66ff\u6362<\/h3>\n<p>#define \u5c5e\u4e8e\u9884\u5904\u7406\u6307\u4ee4&#xff0c;\u4e0d\u662f\u53d8\u91cf\u5b9a\u4e49\u3002\u9884\u5904\u7406\u5668\u4f1a\u5728\u7f16\u8bd1\u524d&#xff0c;\u628a\u5b8f\u540d\u66ff\u6362\u6210\u5b8f\u4f53\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;stdio.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">MAX<\/span> <span class=\"token expression\"><span class=\"token number\">100<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name function\">ADD<\/span><span class=\"token expression\"><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">,<\/span> y<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>x<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span>y<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/span><\/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> <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> MAX<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 function\">ADD<\/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 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>\u5b8f\u53c2\u6570\u548c\u6574\u4e2a\u5b8f\u4f53\u90fd\u5e94\u5c3d\u91cf\u52a0\u62ec\u53f7&#xff0c;\u907f\u514d\u8fd0\u7b97\u4f18\u5148\u7ea7\u5bfc\u81f4\u610f\u5916\u7ed3\u679c\u3002\u5b8f\u6ca1\u6709\u7c7b\u578b\u68c0\u67e5&#xff0c;\u4e5f\u53ef\u80fd\u91cd\u590d\u8ba1\u7b97\u53c2\u6570&#xff0c;\u56e0\u6b64\u590d\u6742\u903b\u8f91\u901a\u5e38\u66f4\u9002\u5408\u5199\u6210\u51fd\u6570\u3002<\/p>\n<hr \/>\n<h3>12. \u6307\u9488&#xff1a;\u4fdd\u5b58\u5730\u5740\u7684\u53d8\u91cf<\/h3>\n<h4>12.1 \u5148\u7406\u89e3\u5185\u5b58<\/h4>\n<p>\u7a0b\u5e8f\u8fd0\u884c\u65f6&#xff0c;\u53d8\u91cf\u9700\u8981\u653e\u5728\u5185\u5b58\u4e2d\u3002\u5185\u5b58\u53ef\u4ee5\u770b\u6210\u8bb8\u591a\u8fde\u7eed\u7684\u5c0f\u683c\u5b50&#xff0c;\u6bcf\u4e2a\u683c\u5b50\u81f3\u5c11\u6709\u4e00\u4e2a\u5730\u5740&#xff1b;\u5728 C \u8bed\u8a00\u91cc&#xff0c;\u5730\u5740\u662f\u4e00\u4e2a\u7528\u4e8e\u5b9a\u4f4d\u5bf9\u8c61\u7684\u6570\u503c\u3002<\/p>\n<p>\u9700\u8981\u533a\u5206\u4e24\u4e2a\u6982\u5ff5&#xff1a;\u5730\u5740\u662f\u4f4d\u7f6e&#xff0c;\u6307\u9488\u662f\u4fdd\u5b58\u5730\u5740\u7684\u5bf9\u8c61&#xff08;\u901a\u5e38\u5c31\u662f\u6307\u9488\u53d8\u91cf&#xff09;\u3002 \u5730\u5740\u672c\u8eab\u4e0d\u662f\u6307\u9488\u53d8\u91cf\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 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\">void<\/span> <span class=\"token operator\">*<\/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>&amp;a \u662f\u53d6\u5730\u5740\u8fd0\u7b97&#xff0c;\u5f97\u5230\u53d8\u91cf a \u7684\u5730\u5740\u3002%p \u7528\u4e8e\u8f93\u51fa\u6307\u9488&#xff0c;\u6309 C \u6807\u51c6\u5e94\u8f6c\u6362\u4e3a void *\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260918201953-6aad9ce91cce6.png\" alt=\"!c-variable-address.svg\" \/><\/p>\n<h4>12.2 \u5b9a\u4e49\u548c\u4f7f\u7528\u6307\u9488<\/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\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span> <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>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 function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> a<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;address &#061; %p\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>p<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;*p &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>p<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>int *p \u8868\u793a p \u662f\u4e00\u4e2a\u201c\u6307\u5411 int \u7684\u6307\u9488\u201d&#xff1b;p \u4e2d\u4fdd\u5b58 a \u7684\u5730\u5740\u3002*p \u662f\u89e3\u5f15\u7528\u8fd0\u7b97&#xff0c;\u8868\u793a\u6cbf\u7740 p \u4fdd\u5b58\u7684\u5730\u5740\u8bbf\u95ee\u90a3\u5757\u5185\u5b58&#xff0c;\u56e0\u6b64 *p \u7684\u503c\u5c31\u662f a \u7684\u503c\u3002<\/p>\n<p>\u6307\u9488\u7c7b\u578b\u5f88\u91cd\u8981\u3002int *\u3001double * \u867d\u7136\u90fd\u4fdd\u5b58\u5730\u5740&#xff0c;\u4f46\u89e3\u5f15\u7528\u65f6&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u6309\u4e0d\u540c\u7c7b\u578b\u89e3\u91ca\u5185\u5b58&#xff0c;\u5e76\u4f7f\u7528\u4e0d\u540c\u7684\u6b65\u957f\u3002\u6307\u9488\u53d8\u91cf\u81ea\u8eab\u7684\u5927\u5c0f\u7531\u5e73\u53f0\u51b3\u5b9a&#xff0c;\u53ef\u4ee5\u7528 sizeof p \u67e5\u8be2&#xff0c;\u4e0d\u8981\u5047\u5b9a\u6c38\u8fdc\u662f 4 \u6216 8 \u5b57\u8282\u3002<\/p>\n<p>\u672a\u6307\u5411\u6709\u6548\u5bf9\u8c61\u7684\u6307\u9488\u4e0d\u80fd\u89e3\u5f15\u7528\u3002\u6ca1\u6709\u76ee\u6807\u65f6&#xff0c;\u5e94\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<h4>12.3 \u4e3a\u4ec0\u4e48\u9700\u8981\u6307\u9488<\/h4>\n<p>C \u7684\u53c2\u6570\u4f20\u9012\u662f\u503c\u4f20\u9012\u3002\u4e0b\u9762\u7684 x \u662f a \u7684\u526f\u672c&#xff1a;<\/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> x<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    x <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/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> <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 function\">change<\/span><span class=\"token punctuation\">(<\/span>a<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> a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 10<\/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><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260918201953-6aad9ce961669.png\" alt=\"!c-pass-by-value.svg\" \/><\/p>\n<p>\u5982\u679c\u628a\u5730\u5740\u4f20\u8fdb\u53bb&#xff0c;\u51fd\u6570\u5c31\u80fd\u627e\u5230\u5e76\u4fee\u6539\u539f\u53d8\u91cf&#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><\/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>pa<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token operator\">*<\/span>pa <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/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> <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 function\">change<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>a<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> a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 20<\/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>\u8fd9\u91cc\u53d1\u751f\u4e86\u4e09\u6b65&#xff1a;<\/p>\n<li>&amp;a \u5f97\u5230 a \u7684\u5730\u5740&#xff1b;<\/li>\n<li>pa \u4fdd\u5b58\u8fd9\u4e2a\u5730\u5740&#xff1b;<\/li>\n<li>pa &#061; 20 \u6839\u636e\u5730\u5740\u627e\u5230 a&#xff0c;\u628a 20 \u5199\u56de\u539f\u6765\u7684\u5185\u5b58\u3002<\/li>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260918201953-6aad9ce9a4119.png\" alt=\"!c-pointer-mutation.svg\" \/><\/p>\n<p>\u53ef\u4ee5\u628a *pa \u6682\u65f6\u7406\u89e3\u4e3a\u201c\u901a\u8fc7 pa \u627e\u5230\u7684\u90a3\u4e2a\u53d8\u91cf\u201d&#xff0c;\u5728\u672c\u4f8b\u4e2d\u5c31\u662f a\u3002<\/p>\n<hr \/>\n<h3>13. \u7ed3\u6784\u4f53&#xff1a;\u628a\u76f8\u5173\u6570\u636e\u653e\u5728\u4e00\u8d77<\/h3>\n<p>\u6570\u7ec4\u53ea\u80fd\u4fdd\u5b58\u4e00\u7ec4\u76f8\u540c\u7c7b\u578b\u7684\u6570\u636e\u3002\u73b0\u5b9e\u4e2d\u7684\u4e00\u4e2a\u5bf9\u8c61\u5f80\u5f80\u7531\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u7ec4\u6210&#xff0c;\u4f8b\u5982\u5b66\u751f\u540c\u65f6\u6709\u59d3\u540d\u3001\u5e74\u9f84\u548c\u5b66\u53f7\u3002\u7ed3\u6784\u4f53\u7528\u4e8e\u63cf\u8ff0\u8fd9\u6837\u7684\u590d\u5408\u6570\u636e\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;stdio.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">student<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> name<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 keyword\">int<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> id<span class=\"token punctuation\">[<\/span><span class=\"token number\">15<\/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\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">student<\/span> s <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;\u5f20\u4e09&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;20260001&#034;<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">student<\/span> <span class=\"token operator\">*<\/span>ps <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>s<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name &#061; %s, age &#061; %d, id &#061; %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n           s<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>age<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span>id<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;name &#061; %s, age &#061; %d, id &#061; %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n           ps<span class=\"token operator\">-&gt;<\/span>name<span class=\"token punctuation\">,<\/span> ps<span class=\"token operator\">-&gt;<\/span>age<span class=\"token punctuation\">,<\/span> ps<span class=\"token operator\">-&gt;<\/span>id<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<ul>\n<li>s.name&#xff1a;\u901a\u8fc7\u7ed3\u6784\u4f53\u53d8\u91cf\u8bbf\u95ee\u6210\u5458\u3002<\/li>\n<li>ps-&gt;name&#xff1a;\u901a\u8fc7\u7ed3\u6784\u4f53\u6307\u9488\u8bbf\u95ee\u6210\u5458\u3002<\/li>\n<li>ps-&gt;name \u7b49\u4ef7\u4e8e (*ps).name\u3002\u62ec\u53f7\u4e0d\u80fd\u7701\u7565&#xff0c;\u56e0\u4e3a . \u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e \u3002<\/li>\n<\/ul>\n<p>\u7ed3\u6784\u4f53\u6210\u5458\u6309\u58f0\u660e\u987a\u5e8f\u6392\u5217&#xff0c;\u4f46\u7f16\u8bd1\u5668\u53ef\u80fd\u4e3a\u4e86\u5bf9\u9f50\u5728\u6210\u5458\u4e4b\u95f4\u63d2\u5165\u586b\u5145\u5b57\u8282&#xff0c;\u56e0\u6b64 sizeof(struct student) \u4e0d\u4e00\u5b9a\u7b49\u4e8e\u5404\u6210\u5458\u5927\u5c0f\u7684\u7b80\u5355\u76f8\u52a0\u3002<\/p>\n<p>\u5982\u679c\u4e0d\u60f3\u6bcf\u6b21\u90fd\u5199 struct student&#xff0c;\u53ef\u4ee5\u7528 typedef \u8d77\u522b\u540d&#xff1a;<\/p>\n<p><span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> name<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 keyword\">int<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> id<span class=\"token punctuation\">[<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> Student<span class=\"token punctuation\">;<\/span><\/p>\n<p>Student s <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;\u5f20\u4e09&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;20260001&#034;<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>\u7ed3\u8bed&#xff1a;\u628a\u77e5\u8bc6\u4e32\u8d77\u6765<\/h3>\n<p>\u73b0\u5728\u53ef\u4ee5\u7528\u4e00\u6761\u4e3b\u7ebf\u56de\u987e C \u8bed\u8a00&#xff1a;<\/p>\n<ul>\n<li>\u7c7b\u578b\u89c4\u5b9a\u6570\u636e\u5982\u4f55\u89e3\u91ca&#xff1b;<\/li>\n<li>\u53d8\u91cf\u7ed9\u5185\u5b58\u4e2d\u7684\u6570\u636e\u547d\u540d&#xff1b;<\/li>\n<li>\u8fd0\u7b97\u7b26\u5904\u7406\u6570\u636e&#xff1b;<\/li>\n<li>\u9009\u62e9\u548c\u5faa\u73af\u63a7\u5236\u6267\u884c\u8def\u5f84&#xff1b;<\/li>\n<li>\u51fd\u6570\u7ec4\u7ec7\u53ef\u590d\u7528\u7684\u64cd\u4f5c&#xff1b;<\/li>\n<li>\u6570\u7ec4\u8fde\u7eed\u4fdd\u5b58\u540c\u7c7b\u578b\u6570\u636e&#xff1b;<\/li>\n<li>\u6307\u9488\u4fdd\u5b58\u5730\u5740&#xff0c;\u8ba9\u7a0b\u5e8f\u80fd\u591f\u95f4\u63a5\u8bbf\u95ee\u548c\u4fee\u6539\u5185\u5b58&#xff1b;<\/li>\n<li>\u7ed3\u6784\u4f53\u628a\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u7ec4\u5408\u6210\u4e00\u4e2a\u66f4\u5927\u7684\u5bf9\u8c61&#xff1b;<\/li>\n<li>static\u3001extern \u548c\u5b8f\u63a7\u5236\u540d\u5b57\u7684\u53ef\u89c1\u8303\u56f4\u3001\u751f\u547d\u5468\u671f\u548c\u7f16\u8bd1\u524d\u66ff\u6362\u3002<\/li>\n<\/ul>\n<p>\u7406\u89e3\u8fd9\u4e9b\u6982\u5ff5\u540e&#xff0c;\u518d\u5b66\u4e60\u52a8\u6001\u5185\u5b58\u3001\u6587\u4ef6\u3001\u51fd\u6570\u6307\u9488\u548c\u6570\u636e\u7ed3\u6784&#xff0c;\u5c31\u4e0d\u518d\u662f\u8bb0\u5fc6\u5b64\u7acb\u7684\u8bed\u6cd5&#xff0c;\u800c\u662f\u5728\u540c\u4e00\u5957\u201c\u6570\u636e\u3001\u5185\u5b58\u548c\u64cd\u4f5c\u201d\u7684\u6a21\u578b\u4e0a\u7ee7\u7eed\u5c55\u5f00\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/#content_views .toc,\/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/#content_views.markdown_views &gt; p:empty:has(+ .toc),#content_views.markdown_views &gt; .toc + p:empty,\/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/#content<\/p>\n","protected":false},"author":2,"featured_media":107135,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11653,174],"topic":[],"class_list":["post-107141","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-11653","tag-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010C\u8bed\u8a00\u3011\u521d\u8bc6 C \u8bed\u8a00\uff08\u70b9\u5230\u4e3a\u6b62\uff09 - \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\/107141.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010C\u8bed\u8a00\u3011\u521d\u8bc6 C \u8bed\u8a00\uff08\u70b9\u5230\u4e3a\u6b62\uff09 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\/* MD \/ \u5bcc\u6587\u672c\u4e2d\u7684 .toc\uff08\u542b\u535a\u5ba2\u56ed\u642c\u5bb6\u7b49\u5d4c\u5957\u7ed3\u6784\uff09\uff1b.toc-box \u5728\u4fa7\u680f\uff0c\u4e0d\u53d7\u5f71\u54cd *\/#content_views .toc,\/* \u7f16\u8f91\u5668\u5e38\u5728\u76ee\u5f55\u524d\u540e\u63d2\u5165\u7a7a p\uff08:empty \u4ecd\u5360 20px\uff09\uff0c\u4e00\u5e76\u53bb\u6389\u907f\u514d\u9876\u7a7a\u9699 *\/#content_views.markdown_views &gt; p:empty:has(+ .toc),#content_views.markdown_views &gt; .toc + p:empty,\/* \u5bcc\u6587\u672c\u65e7\u7248\u76ee\u5f55\u6807\u8bb0 *\/#content\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/107141.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-18T20:19:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260918201952-6aad9ce84cfd5.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 \u5206\" \/>\n<script type=\"application\/ld+json\" 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