{"id":47419,"date":"2025-07-30T07:47:14","date_gmt":"2025-07-29T23:47:14","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/47419.html"},"modified":"2025-07-30T07:47:14","modified_gmt":"2025-07-29T23:47:14","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3c%e8%af%ad%e8%a8%80%e6%8c%87%e9%92%88%ef%bc%88%e4%b8%8a%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/47419.html","title":{"rendered":"\u6df1\u5165\u7406\u89e3C\u8bed\u8a00\u6307\u9488\uff08\u4e0a\uff09"},"content":{"rendered":"<h3>\u4e00\u3001\u5185\u5b58\u548c\u5730\u5740<\/h3>\n<h4>1.1 \u5185\u5b58\u7684\u57fa\u672c\u6982\u5ff5<\/h4>\n<p>\u751f\u6d3b\u4e2d&#xff0c;\u4e00\u680b\u5bbf\u820d\u697c\u7684\u6bcf\u4e2a\u623f\u95f4\u90fd\u6709\u552f\u4e00\u7f16\u53f7&#xff08;\u5982101\u3001202&#xff09;&#xff0c;\u901a\u8fc7\u7f16\u53f7\u80fd\u5feb\u901f\u627e\u5230\u76ee\u6807\u623f\u95f4\u3002\u8ba1\u7b97\u673a\u7684\u5185\u5b58\u7ba1\u7406\u4e0e\u4e4b\u7c7b\u4f3c&#xff1a;<\/p>\n<ul>\n<li>\u5185\u5b58\u88ab\u5212\u5206\u4e3a\u4e00\u4e2a\u4e2a1\u5b57\u8282\u7684\u5185\u5b58\u5355\u5143&#xff0c;\u6bcf\u4e2a\u5355\u5143\u90fd\u6709\u552f\u4e00\u7f16\u53f7&#xff08;\u5373\u5730\u5740&#xff09;<\/li>\n<li>CPU\u901a\u8fc7\u5730\u5740\u5feb\u901f\u8bfb\u5199\u5185\u5b58\u4e2d\u7684\u6570\u636e&#xff0c;\u907f\u514d\u9010\u4e2a\u67e5\u627e\u7684\u4f4e\u6548\u64cd\u4f5c<\/li>\n<\/ul>\n<h4>1.2 \u8ba1\u7b97\u673a\u5b58\u50a8\u5355\u4f4d<\/h4>\n<p>\u5185\u5b58\u5355\u4f4d\u7684\u6362\u7b97\u5173\u7cfb\u662f\u7406\u89e3\u5185\u5b58\u7684\u57fa\u7840&#xff1a;<\/p>\n<table>\n<tr>\u5355\u4f4d\u8bf4\u660e\u6362\u7b97\u5173\u7cfb<\/tr>\n<tbody>\n<tr>\n<td>bit&#xff08;\u6bd4\u7279\u4f4d&#xff09;<\/td>\n<td>\u6700\u5c0f\u5b58\u50a8\u5355\u4f4d&#xff0c;\u5b581\u62160<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td>byte&#xff08;\u5b57\u8282&#xff09;<\/td>\n<td>\u57fa\u7840\u5b58\u50a8\u5355\u4f4d<\/td>\n<td>1byte &#061; 8bit<\/td>\n<\/tr>\n<tr>\n<td>KB<\/td>\n<td>\u5343\u5b57\u8282<\/td>\n<td>1KB &#061; 1024byte<\/td>\n<\/tr>\n<tr>\n<td>MB<\/td>\n<td>\u5146\u5b57\u8282<\/td>\n<td>1MB &#061; 1024KB<\/td>\n<\/tr>\n<tr>\n<td>GB<\/td>\n<td>\u5409\u5b57\u8282<\/td>\n<td>1GB &#061; 1024MB<\/td>\n<\/tr>\n<tr>\n<td>TB<\/td>\n<td>\u592a\u5b57\u8282<\/td>\n<td>1TB &#061; 1024GB<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>1.3 \u5730\u5740\u7684\u672c\u8d28&#xff1a;\u5730\u5740\u603b\u7ebf<\/h4>\n<p>\u5185\u5b58\u5355\u5143\u7684\u5730\u5740\u4e0d\u662f\u201c\u8bb0\u5f55\u201d\u51fa\u6765\u7684&#xff0c;\u800c\u662f\u7531\u786c\u4ef6\u8bbe\u8ba1\u51b3\u5b9a\u7684&#xff0c;\u6838\u5fc3\u662f\u5730\u5740\u603b\u7ebf&#xff1a;<\/p>\n<ul>\n<li>32\u4f4d\u673a\u5668\u670932\u6839\u5730\u5740\u603b\u7ebf&#xff0c;\u6bcf\u6839\u7ebf\u8868\u793a0\u62161&#xff08;\u7535\u8109\u51b2\u6709\u65e0&#xff09;<\/li>\n<li>32\u6839\u5730\u5740\u7ebf\u53ef\u8868\u793a (2^{32}) \u4e2a\u5730\u5740&#xff08;\u7ea64GB\u5185\u5b58\u7a7a\u95f4&#xff09;<\/li>\n<li>\u5730\u5740\u901a\u8fc7\u5730\u5740\u603b\u7ebf\u4f20\u9012\u7ed9\u5185\u5b58&#xff0c;\u5185\u5b58\u6839\u636e\u5730\u5740\u8fd4\u56de\u6570\u636e&#xff08;\u901a\u8fc7\u6570\u636e\u603b\u7ebf\u4f20\u7ed9CPU&#xff09;<\/li>\n<\/ul>\n<p>\u7c7b\u6bd4&#xff1a;\u94a2\u7434\u7684\u7434\u952e\u4f4d\u7f6e\u662f\u5236\u9020\u5546\u8bbe\u8ba1\u597d\u7684\u201c\u786c\u4ef6\u7ea6\u5b9a\u201d&#xff0c;\u6f14\u594f\u8005\u6309\u7ea6\u5b9a\u5373\u53ef\u627e\u5230\u5bf9\u5e94\u97f3\u7b26&#xff1b;\u5730\u5740\u603b\u7ebf\u7684\u8bbe\u8ba1\u4e5f\u662f\u4e00\u79cd\u786c\u4ef6\u7ea6\u5b9a&#xff0c;\u786e\u4fddCPU\u80fd\u51c6\u786e\u8bbf\u95ee\u5185\u5b58\u3002<\/p>\n<h3>\u4e8c\u3001\u6307\u9488\u53d8\u91cf\u548c\u5730\u5740<\/h3>\n<h4>2.1 \u53d6\u5730\u5740\u64cd\u4f5c\u7b26&#xff08;&amp;&#xff09;<\/h4>\n<p>C\u8bed\u8a00\u4e2d&#xff0c;\u521b\u5efa\u53d8\u91cf\u5c31\u662f\u5411\u5185\u5b58\u7533\u8bf7\u7a7a\u95f4\u3002\u7528&amp;\u53ef\u83b7\u53d6\u53d8\u91cf\u7684\u5730\u5740&#xff08;\u5373\u5185\u5b58\u5355\u5143\u7684\u7f16\u53f7&#xff09;&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/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>  <span class=\"token comment\">\/\/ \u7533\u8bf74\u5b57\u8282\u5185\u5b58&#xff0c;\u5b58\u653e10<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a\u7684\u5730\u5740&#xff1a;%p\\\\n&#034;<\/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 comment\">\/\/ %p\u7528\u4e8e\u6253\u5370\u5730\u5740&#xff0c;\u8f93\u51fa\u7c7b\u4f3c0x006FFD70<\/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>\u6ce8\u610f&#xff1a;&amp;a\u83b7\u53d6\u7684\u662fa\u5360\u7528\u76844\u4e2a\u5b57\u8282\u4e2d\u5730\u5740\u6700\u5c0f\u7684\u90a3\u4e2a\u5b57\u8282\u7684\u5730\u5740\u3002<\/p>\n<h4>2.2 \u6307\u9488\u53d8\u91cf&#xff1a;\u5b58\u50a8\u5730\u5740\u7684\u53d8\u91cf<\/h4>\n<p>\u5730\u5740\u662f\u6570\u503c&#xff0c;\u9700\u8981\u4e13\u95e8\u7684\u53d8\u91cf\u5b58\u50a8&#xff0c;\u8fd9\u7c7b\u53d8\u91cf\u79f0\u4e3a\u6307\u9488\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><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/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> pa <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ pa\u662f\u6307\u9488\u53d8\u91cf&#xff0c;\u5b58\u50a8a\u7684\u5730\u5740<\/span><br \/>\n    <span class=\"token comment\">\/\/ int* \u8868\u793apa\u662f\u6307\u5411int\u7c7b\u578b\u53d8\u91cf\u7684\u6307\u9488<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u6307\u9488\u53d8\u91cf\u7684\u7c7b\u578b\u683c\u5f0f&#xff1a;\u7c7b\u578b*&#xff08;\u5982int*\u3001char*&#xff09;<\/li>\n<li>*\u8bf4\u660e\u8be5\u53d8\u91cf\u662f\u6307\u9488&#xff0c;\u524d\u9762\u7684int\/char\u8868\u793a\u6307\u9488\u6307\u5411\u7684\u53d8\u91cf\u7c7b\u578b<\/li>\n<\/ul>\n<h4>2.3 \u89e3\u5f15\u7528\u64cd\u4f5c\u7b26&#xff08;*&#xff09;<\/h4>\n<p>\u901a\u8fc7\u6307\u9488\u53d8\u91cf\u7684\u5730\u5740&#xff0c;\u53ef\u4f7f\u7528*&#xff08;\u89e3\u5f15\u7528\u64cd\u4f5c\u7b26&#xff09;\u8bbf\u95ee\u6307\u5411\u7684\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><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/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\">100<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> pa <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">*<\/span>pa <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u901a\u8fc7pa\u7684\u5730\u5740\u627e\u5230a&#xff0c;\u5c06a\u6539\u4e3a0<\/span><br \/>\n    <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>  <span class=\"token comment\">\/\/ \u8f93\u51faa &#061; 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<ul>\n<li>*pa\u7b49\u4ef7\u4e8ea&#xff0c;\u901a\u8fc7\u6307\u9488\u95f4\u63a5\u4fee\u6539\u53d8\u91cf\u7684\u503c&#xff0c;\u589e\u52a0\u4e86\u64cd\u4f5c\u7075\u6d3b\u6027\u3002<\/li>\n<\/ul>\n<h4>2.4 \u6307\u9488\u53d8\u91cf\u7684\u5927\u5c0f<\/h4>\n<p>\u6307\u9488\u53d8\u91cf\u7684\u5927\u5c0f\u53d6\u51b3\u4e8e\u5730\u5740\u7684\u4f4d\u6570&#xff0c;\u4e0e\u6307\u5411\u7684\u7c7b\u578b\u65e0\u5173&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/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;char* \u5927\u5c0f&#xff1a;%zd\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 4\u5b57\u8282&#xff08;32\u4f4d&#xff09;\/8\u5b57\u8282&#xff08;64\u4f4d&#xff09;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;int* \u5927\u5c0f&#xff1a;%zd\\\\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 operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u540c\u4e0a<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;double* \u5927\u5c0f&#xff1a;%zd\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u540c\u4e0a<\/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>32\u4f4d\u5e73\u53f0&#xff1a;\u5730\u5740\u662f32\u4f4d&#xff08;4\u5b57\u8282&#xff09;&#xff0c;\u6240\u6709\u6307\u9488\u53d8\u91cf\u90fd\u662f4\u5b57\u8282<\/li>\n<li>64\u4f4d\u5e73\u53f0&#xff1a;\u5730\u5740\u662f64\u4f4d&#xff08;8\u5b57\u8282&#xff09;&#xff0c;\u6240\u6709\u6307\u9488\u53d8\u91cf\u90fd\u662f8\u5b57\u8282<\/li>\n<\/ul>\n<h3>\u4e09\u3001\u6307\u9488\u53d8\u91cf\u7c7b\u578b\u7684\u610f\u4e49<\/h3>\n<p>\u6307\u9488\u7c7b\u578b\u4e0d\u5f71\u54cd\u5927\u5c0f&#xff0c;\u4f46\u51b3\u5b9a\u4e86\u64cd\u4f5c\u6743\u9650\u548c\u6b65\u957f&#xff1a;<\/p>\n<h4>3.1 \u89e3\u5f15\u7528\u7684\u6743\u9650<\/h4>\n<p>\u6307\u9488\u7c7b\u578b\u51b3\u5b9a\u89e3\u5f15\u7528\u65f6\u8bbf\u95ee\u7684\u5b57\u8282\u6570&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0x11223344<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5047\u8bbe\u5185\u5b58\u4e2d\u5b58\u50a8\u4e3a0x44,0x33,0x22,0x11&#xff08;\u5c0f\u7aef&#xff09;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> pi <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>n<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">*<\/span>pi <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ int*\u89e3\u5f15\u7528\u8bbf\u95ee4\u5b57\u8282&#xff0c;n\u53d8\u4e3a0x00000000<\/span><\/p>\n<p>    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> pc <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>n<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">*<\/span>pc <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ char*\u89e3\u5f15\u7528\u8bbf\u95ee1\u5b57\u8282&#xff0c;n\u53d8\u4e3a0x11223300<\/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>int*\u89e3\u5f15\u7528&#xff1a;\u64cd\u4f5c4\u5b57\u8282<\/li>\n<li>char*\u89e3\u5f15\u7528&#xff1a;\u64cd\u4f5c1\u5b57\u8282<\/li>\n<\/ul>\n<h4>3.2 \u6307\u9488\u00b1\u6574\u6570\u7684\u6b65\u957f<\/h4>\n<p>\u6307\u9488\u00b1\u6574\u6570\u65f6&#xff0c;\u6b65\u957f\u7531\u6307\u9488\u7c7b\u578b\u51b3\u5b9a&#xff08;\u5373\u8df3\u8fc7\u7684\u5b57\u8282\u6570&#xff09;&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> pc <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>n<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> pi <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>n<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&amp;n &#061; %p\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u5047\u8bbe\u8f93\u51fa0x00AFF974<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;pc &#043; 1 &#061; %p\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> pc <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\">\/\/ 0x00AFF975&#xff08;&#043;1\u5b57\u8282&#xff09;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;pi &#043; 1 &#061; %p\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> pi <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\">\/\/ 0x00AFF978&#xff08;&#043;4\u5b57\u8282&#xff09;<\/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>char*\u00b11&#xff1a;\u8df3\u8fc71\u5b57\u8282<\/li>\n<li>int*\u00b11&#xff1a;\u8df3\u8fc74\u5b57\u8282<\/li>\n<li>double*\u00b11&#xff1a;\u8df3\u8fc78\u5b57\u8282<\/li>\n<\/ul>\n<h4>3.3 void* \u6307\u9488&#xff1a;\u6cdb\u578b\u6307\u9488<\/h4>\n<p>void*\u53ef\u63a5\u6536\u4efb\u610f\u7c7b\u578b\u7684\u5730\u5740&#xff0c;\u4f46\u4e0d\u80fd\u76f4\u63a5\u89e3\u5f15\u7528\u6216\u00b1\u6574\u6570&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/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\">void<\/span><span class=\"token operator\">*<\/span> pv <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5408\u6cd5&#xff1a;void*\u63a5\u6536int*\u5730\u5740<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ *pv &#061; 20;  \/\/ \u9519\u8bef&#xff1a;void*\u4e0d\u80fd\u76f4\u63a5\u89e3\u5f15\u7528<\/span><br \/>\n    <span class=\"token comment\">\/\/ pv &#043; 1;    \/\/ \u9519\u8bef&#xff1a;void*\u4e0d\u80fd\u00b1\u6574\u6570<\/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>\u7528\u9014&#xff1a;\u51fd\u6570\u53c2\u6570\u4e2d\u63a5\u6536\u4efb\u610f\u7c7b\u578b\u5730\u5740&#xff08;\u5982memcpy\u51fd\u6570&#xff09;&#xff0c;\u5b9e\u73b0\u6cdb\u578b\u7f16\u7a0b\u3002<\/li>\n<\/ul>\n<h3>\u56db\u3001const\u4fee\u9970\u6307\u9488<\/h3>\n<p>const\u53ef\u9650\u5236\u6307\u9488\u6216\u5176\u6307\u5411\u7684\u5185\u5bb9\u662f\u5426\u53ef\u4fee\u6539&#xff0c;\u4f4d\u7f6e\u4e0d\u540c\u6548\u679c\u4e0d\u540c&#xff1a;<\/p>\n<h4>4.1 const\u5728*\u5de6\u8fb9&#xff1a;\u9650\u5236\u6307\u5411\u7684\u5185\u5bb9<\/h4>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> p<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u7b49\u4ef7\u4e8eint const* p;<\/span><\/p>\n<ul>\n<li>\u6307\u9488p\u6307\u5411\u7684\u5185\u5bb9&#xff08;*p&#xff09;\u4e0d\u80fd\u901a\u8fc7p\u4fee\u6539<\/li>\n<li>\u6307\u9488p\u672c\u8eab\u53ef\u4ee5\u6307\u5411\u5176\u4ed6\u5730\u5740<\/li>\n<\/ul>\n<h4>4.2 const\u5728*\u53f3\u8fb9&#xff1a;\u9650\u5236\u6307\u9488\u672c\u8eab<\/h4>\n<p><span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> <span class=\"token keyword\">const<\/span> p<span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u6307\u9488p\u672c\u8eab\u4e0d\u80fd\u4fee\u6539&#xff08;\u4e0d\u80fd\u6307\u5411\u5176\u4ed6\u5730\u5740&#xff09;<\/li>\n<li>\u6307\u5411\u7684\u5185\u5bb9&#xff08;*p&#xff09;\u53ef\u4ee5\u4fee\u6539<\/li>\n<\/ul>\n<h4>4.3 \u5de6\u53f3\u90fd\u6709const&#xff1a;\u4e24\u8005\u90fd\u9650\u5236<\/h4>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> <span class=\"token keyword\">const<\/span> p<span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u6307\u9488p\u672c\u8eab\u4e0d\u80fd\u4fee\u6539<\/li>\n<li>\u6307\u5411\u7684\u5185\u5bb9&#xff08;*p&#xff09;\u4e5f\u4e0d\u80fd\u4fee\u6539<\/li>\n<\/ul>\n<p>\u793a\u4f8b\u9a8c\u8bc1&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/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> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> p1 <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ *p1 &#061; 30;  \/\/ \u9519\u8bef&#xff1a;\u4e0d\u80fd\u4fee\u6539\u6307\u5411\u7684\u5185\u5bb9<\/span><br \/>\n    p1 <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>b<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u5408\u6cd5&#xff1a;\u6307\u9488\u672c\u8eab\u53ef\u6539<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> <span class=\"token keyword\">const<\/span> p2 <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">*<\/span>p2 <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u5408\u6cd5&#xff1a;\u6307\u5411\u7684\u5185\u5bb9\u53ef\u6539<\/span><br \/>\n    <span class=\"token comment\">\/\/ p2 &#061; &amp;b;    \/\/ \u9519\u8bef&#xff1a;\u6307\u9488\u672c\u8eab\u4e0d\u53ef\u6539<\/span><\/p>\n<p>    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> <span class=\"token keyword\">const<\/span> p3 <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ *p3 &#061; 30;   \/\/ \u9519\u8bef<\/span><br \/>\n    <span class=\"token comment\">\/\/ p3 &#061; &amp;b;    \/\/ \u9519\u8bef<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u4e94\u3001\u6307\u9488\u8fd0\u7b97<\/h3>\n<p>\u6307\u9488\u6709\u4e09\u79cd\u57fa\u672c\u8fd0\u7b97&#xff1a;\u00b1\u6574\u6570\u3001\u6307\u9488-\u6307\u9488\u3001\u5173\u7cfb\u8fd0\u7b97\u3002<\/p>\n<h4>5.1 \u6307\u9488\u00b1\u6574\u6570<\/h4>\n<p>\u7ed3\u5408\u6570\u7ec4\u4f7f\u7528&#xff0c;\u901a\u8fc7\u6307\u9488\u904d\u5386\u6570\u7ec4&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> arr<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> p <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6570\u7ec4\u540d\u662f\u9996\u5143\u7d20\u5730\u5740&#xff0c;\u7b49\u4ef7\u4e8e&amp;arr[0]<\/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;%d &#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">&#043;<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u7b49\u4ef7\u4e8earr[i]&#xff0c;\u8f93\u51fa1 2 3 4 5<\/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<h4>5.2 \u6307\u9488-\u6307\u9488<\/h4>\n<p>\u4e24\u4e2a\u6307\u9488\u76f8\u51cf\u7684\u7ed3\u679c\u662f\u4e4b\u95f4\u7684\u5143\u7d20\u4e2a\u6570&#xff08;\u9700\u6307\u5411\u540c\u4e00\u6570\u7ec4&#xff09;&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token comment\">\/\/ \u6a21\u62dfstrlen&#xff1a;\u8ba1\u7b97\u5b57\u7b26\u4e32\u957f\u5ea6&#xff08;\\\\0\u4e4b\u524d\u7684\u5b57\u7b26\u6570&#xff09;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">my_strlen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> start <span class=\"token operator\">&#061;<\/span> s<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>s <span class=\"token operator\">!&#061;<\/span> <span class=\"token string\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ \u904d\u5386\u5230\\\\0\u505c\u6b62<\/span><br \/>\n        s<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> s <span class=\"token operator\">&#8211;<\/span> start<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6307\u9488\u76f8\u51cf\u5f97\u957f\u5ea6<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/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;abc\u7684\u957f\u5ea6&#xff1a;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">my_strlen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;abc&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa3<\/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<h4>5.3 \u6307\u9488\u7684\u5173\u7cfb\u8fd0\u7b97<\/h4>\n<p>\u6307\u9488\u53ef\u6bd4\u8f83\u5927\u5c0f&#xff08;\u5730\u5740\u9ad8\u4f4e&#xff09;&#xff0c;\u5e38\u7528\u4e8e\u6570\u7ec4\u904d\u5386&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> arr<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> p <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">&lt;<\/span> arr <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ \u6307\u9488\u6bd4\u8f83&#xff1a;p\u672a\u8d85\u8fc7\u6570\u7ec4\u672b\u5c3e<\/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> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        p<span class=\"token operator\">&#043;&#043;<\/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<h3>\u516d\u3001\u91ce\u6307\u9488<\/h3>\n<p>\u91ce\u6307\u9488&#xff1a;\u6307\u5411\u4f4d\u7f6e\u672a\u77e5&#xff08;\u968f\u673a\u3001\u4e0d\u6b63\u786e&#xff09;\u7684\u6307\u9488&#xff0c;\u64cd\u4f5c\u91ce\u6307\u9488\u53ef\u80fd\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u3002<\/p>\n<h4>6.1 \u91ce\u6307\u9488\u6210\u56e0<\/h4>\n<li>\u6307\u9488\u672a\u521d\u59cb\u5316&#xff1a;\u5c40\u90e8\u6307\u9488\u9ed8\u8ba4\u503c\u968f\u673a<\/li>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> p<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u672a\u521d\u59cb\u5316&#xff0c;\u503c\u968f\u673a<\/span><br \/>\n    <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5371\u9669&#xff1a;\u64cd\u4f5c\u91ce\u6307\u9488<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<li>\u6307\u9488\u8d8a\u754c\u8bbf\u95ee&#xff1a;\u8d85\u51fa\u6570\u7ec4\u7b49\u7533\u8bf7\u7684\u7a7a\u95f4<\/li>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> arr<span class=\"token punctuation\">[<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> p <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">;<\/span><br \/>\n    <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;&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ i&#061;10\u65f6\u8d8a\u754c<\/span><br \/>\n        <span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span>p<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;<\/span> i<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<li>\u8fd4\u56de\u5c40\u90e8\u53d8\u91cf\u7684\u5730\u5740&#xff1a;\u5c40\u90e8\u53d8\u91cf\u9500\u6bc1\u540e\u5730\u5740\u65e0\u6548<\/li>\n<p><span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&amp;<\/span>n<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ n\u662f\u5c40\u90e8\u53d8\u91cf&#xff0c;\u51fd\u6570\u7ed3\u675f\u540e\u9500\u6bc1<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> p <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5371\u9669&#xff1a;\u8bbf\u95ee\u5df2\u9500\u6bc1\u7684\u53d8\u91cf<\/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<h4>6.2 \u89c4\u907f\u91ce\u6307\u9488<\/h4>\n<li>\u521d\u59cb\u5316\u6307\u9488&#xff1a;\u672a\u77e5\u6307\u5411\u65f6\u8d4bNULL&#xff08;NULL\u662f0\u5730\u5740&#xff0c;\u4e0d\u53ef\u8bbf\u95ee&#xff09;<\/li>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/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> p1 <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u660e\u786e\u6307\u5411\u65f6\u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> p2 <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u672a\u77e5\u6307\u5411\u65f6\u8d4bNULL<\/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<li>\n<p>\u907f\u514d\u8d8a\u754c\u8bbf\u95ee&#xff1a;\u786e\u4fdd\u6307\u9488\u64cd\u4f5c\u5728\u7533\u8bf7\u7684\u7a7a\u95f4\u5185<\/p>\n<\/li>\n<li>\n<p>\u6307\u9488\u4e0d\u7528\u65f6\u7f6e\u4e3aNULL&#xff0c;\u4f7f\u7528\u524d\u68c0\u67e5<\/p>\n<\/li>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> arr<span class=\"token punctuation\">[<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> p <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4f7f\u7528\u540e\u7f6eNULL<\/span><br \/>\n    p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4f7f\u7528\u524d\u68c0\u67e5<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token operator\">*<\/span>p <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/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<li>\u4e0d\u8fd4\u56de\u5c40\u90e8\u53d8\u91cf\u7684\u5730\u5740<\/li>\n<h3>\u4e03\u3001assert\u65ad\u8a00<\/h3>\n<p>assert\u5b8f\u7528\u4e8e\u8c03\u8bd5\u65f6\u9a8c\u8bc1\u6761\u4ef6&#xff0c;\u82e5\u4e0d\u6ee1\u8db3\u5219\u62a5\u9519\u7ec8\u6b62\u7a0b\u5e8f&#xff0c;\u9700\u5305\u542b&lt;assert.h&gt;\u3002<\/p>\n<h4>7.1 \u57fa\u672c\u4f7f\u7528<\/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><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;assert.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> p <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6761\u4ef6\u4e3a\u5047&#xff0c;\u7a0b\u5e8f\u7ec8\u6b62\u5e76\u62a5\u9519<\/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>\u62a5\u9519\u4fe1\u606f\u5305\u542b\u6587\u4ef6\u540d\u3001\u884c\u53f7\u548c\u5931\u8d25\u7684\u6761\u4ef6&#xff0c;\u4fbf\u4e8e\u8c03\u8bd5\u3002<\/li>\n<\/ul>\n<h4>7.2 \u7981\u7528assert<\/h4>\n<p>\u5b9a\u4e49NDEBUG\u53ef\u7981\u7528\u6240\u6709assert&#xff08;Release\u7248\u672c\u5e38\u7528&#xff0c;\u51cf\u5c11\u6027\u80fd\u6d88\u8017&#xff09;&#xff1a;<\/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\">NDEBUG<\/span>  <span class=\"token comment\">\/\/ \u653e\u5728#include &lt;assert.h&gt;\u524d<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;assert.h&gt;<\/span><\/span><br \/>\n<span class=\"token comment\">\/\/ \u6b64\u65f6assert\u65e0\u6548<\/span><\/p>\n<h3>\u516b\u3001\u6307\u9488\u7684\u4f7f\u7528\u548c\u4f20\u5740\u8c03\u7528<\/h3>\n<h4>8.1 \u4f20\u503c\u8c03\u7528 vs \u4f20\u5740\u8c03\u7528<\/h4>\n<ul>\n<li>\u4f20\u503c\u8c03\u7528&#xff1a;\u51fd\u6570\u63a5\u6536\u53d8\u91cf\u7684\u526f\u672c&#xff0c;\u4fee\u6539\u526f\u672c\u4e0d\u5f71\u54cd\u539f\u53d8\u91cf<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/\/ \u5931\u8d25\u7684\u4ea4\u6362\u51fd\u6570&#xff08;\u4f20\u503c\u8c03\u7528&#xff09;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">Swap1<\/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\">int<\/span> tmp <span class=\"token operator\">&#061;<\/span> x<span class=\"token punctuation\">;<\/span><br \/>\n    x <span class=\"token operator\">&#061;<\/span> y<span class=\"token punctuation\">;<\/span><br \/>\n    y <span class=\"token operator\">&#061;<\/span> tmp<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u53ea\u4fee\u6539\u5f62\u53c2x\u3001y&#xff0c;\u4e0d\u5f71\u54cd\u5b9e\u53c2<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/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> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">Swap1<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4ea4\u6362\u540ea\u3001b\u4ecd\u4e3a10\u300120<\/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>\u4f20\u5740\u8c03\u7528&#xff1a;\u51fd\u6570\u63a5\u6536\u53d8\u91cf\u7684\u5730\u5740&#xff0c;\u901a\u8fc7\u6307\u9488\u4fee\u6539\u539f\u53d8\u91cf<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/\/ \u6210\u529f\u7684\u4ea4\u6362\u51fd\u6570&#xff08;\u4f20\u5740\u8c03\u7528&#xff09;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">Swap2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> px<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span> py<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> tmp <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>px<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">*<\/span>px <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>py<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token operator\">*<\/span>py <span class=\"token operator\">&#061;<\/span> tmp<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u901a\u8fc7\u5730\u5740\u4fee\u6539\u539f\u53d8\u91cf<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/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> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">Swap2<\/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 punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4ea4\u6362\u540ea&#061;20&#xff0c;b&#061;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<h4>8.2 \u6a21\u62df\u5b9e\u73b0strlen&#xff08;\u4f20\u5740\u8c03\u7528\u5e94\u7528&#xff09;<\/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><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;assert.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">my_strlen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>str <span class=\"token operator\">!&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u786e\u4fddstr\u4e0d\u662fNULL<\/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 keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>str <span class=\"token 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punctuation\">(<\/span><span class=\"token string\">&#034;\u957f\u5ea6&#xff1a;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">my_strlen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;abcdef&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa6<\/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 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