{"id":65480,"date":"2026-01-25T01:32:22","date_gmt":"2026-01-24T17:32:22","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/65480.html"},"modified":"2026-01-25T01:32:22","modified_gmt":"2026-01-24T17:32:22","slug":"c%e8%af%ad%e8%a8%80-typedef%e3%80%81%e5%85%b1%e7%94%a8%e4%bd%93%e3%80%81%e4%bd%8d%e8%bf%90%e7%ae%97%e3%80%81%e4%bd%8d%e6%ae%b5%e3%80%81%e6%9e%9a%e4%b8%be%e7%b1%bb%e5%9e%8b%e3%80%81%e5%86%85%e5%ad%98","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/65480.html","title":{"rendered":"c\u8bed\u8a00 typedef\u3001\u5171\u7528\u4f53\u3001\u4f4d\u8fd0\u7b97\u3001\u4f4d\u6bb5\u3001\u679a\u4e3e\u7c7b\u578b\u3001\u5185\u5b58\u7ba1\u7406"},"content":{"rendered":"<\/p>\n<h4>\u76ee\u5f55<\/h4>\n<ul>\n<li>\u4e00\u3001typedef<\/li>\n<li>\n<ul>\n<li>1.1 \u58f0\u660e\u6574\u578b<\/li>\n<li>1.2 \u58f0\u660e\u7ed3\u6784\u4f53\u7c7b\u578b<\/li>\n<li>1.3 \u58f0\u660e\u6570\u7ec4<\/li>\n<li>1.4 \u58f0\u660e\u6307\u9488<\/li>\n<li>1.5 \u58f0\u660e\u6570\u7ec4\u6307\u9488<\/li>\n<li>1.6 \u58f0\u660e\u51fd\u6570\u6307\u9488<\/li>\n<li>1.7 \u58f0\u660e\u679a\u4e3e\u7c7b\u578b<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001\u5171\u7528\u4f53<\/li>\n<li>\n<ul>\n<li>2.1 \u5171\u7528\u4f53\u7684\u5b9a\u4e49<\/li>\n<li>2.2 \u5171\u7528\u4f53 vs \u7ed3\u6784\u4f53<\/li>\n<li>2.3 \u4f7f\u7528\u793a\u4f8b<\/li>\n<li>2.4 \u5178\u578b\u5e94\u7528\u573a\u666f<\/li>\n<li>2.5 \u4e0e\u7ed3\u6784\u4f53\u5d4c\u5957\u4f7f\u7528<\/li>\n<li>2.6 \u603b\u7ed3<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u4f4d\u8fd0\u7b97<\/li>\n<li>\n<ul>\n<li>3.1 \u6309\u4f4d\u4e0e &amp;<\/li>\n<li>3.2 \u6309\u4f4d\u6216 |<\/li>\n<li>3.3 \u5f02\u6216 ^<\/li>\n<li>3.4 \u53d6\u53cd\u8fd0\u7b97\u7b26 ~<\/li>\n<li>3.5 \u5de6\u79fb\u8fd0\u7b97\u7b26 &lt;&lt;<\/li>\n<li>3.6 \u53f3\u79fb\u8fd0\u7b97\u7b26 &gt;&gt;<\/li>\n<li>3.7 \u8d4b\u503c\u8fd0\u7b97\u7b26<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001 \u4f4d\u6bb5<\/li>\n<li>\u4e94\u3001\u679a\u4e3e\u7c7b\u578b<\/li>\n<li>\n<ul>\n<li>5.1 \u57fa\u672c\u8bed\u6cd5<\/li>\n<li>5.2 \u679a\u4e3e\u5e38\u91cf\u7684\u503c<\/li>\n<li>5.3 \u5b9a\u4e49\u679a\u4e3e\u53d8\u91cf<\/li>\n<li>\n<ul>\n<li>5.3.1 \u5148\u5b9a\u4e49\u7c7b\u578b&#xff0c;\u518d\u58f0\u660e\u53d8\u91cf<\/li>\n<li>5.3.2 \u5b9a\u4e49\u7c7b\u578b\u7684\u540c\u65f6\u58f0\u660e\u53d8\u91cf<\/li>\n<li>5.3.3 \u533f\u540d\u679a\u4e3e&#xff08;\u4e0d\u63a8\u8350&#xff0c;\u9664\u975e\u53ea\u7528\u4e00\u6b21&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>5.4 \u4f7f\u7528 typedef \u7b80\u5316<\/li>\n<li>5.5 \u679a\u4e3e\u7684\u672c\u8d28<\/li>\n<li>5.6 \u5178\u578b\u5e94\u7528\u573a\u666f<\/li>\n<li>\n<ul>\n<li>5.6.1 \u72b6\u6001\u673a<\/li>\n<li>5.6.2 \u9009\u9879\/\u6a21\u5f0f\u9009\u62e9<\/li>\n<li>5.6.3 \u9519\u8bef\u7801<\/li>\n<\/ul>\n<\/li>\n<li>5.7 \u6ce8\u610f\u4e8b\u9879<\/li>\n<li>5.8 \u5b9e\u7528\u6280\u5de7&#xff1a;\u5c06\u679a\u4e3e\u503c\u8f6c\u4e3a\u5b57\u7b26\u4e32<\/li>\n<li>5.9 \u4e0e #define \u5bf9\u6bd4<\/li>\n<li>5.10 \u603b\u7ed3<\/li>\n<\/ul>\n<\/li>\n<li>\u516d\u3001\u5185\u5b58\u7ba1\u7406<\/li>\n<li>\n<ul>\n<li>6.1 \u5b58\u50a8\u6a21\u578b<\/li>\n<li>6.2 \u52a8\u6001\u5185\u5b58<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h2>\u4e00\u3001typedef<\/h2>\n<p>\u5728 C \u8bed\u8a00\u4e2d&#xff0c;typedef \u662f\u4e00\u4e2a\u5173\u952e\u5b57&#xff0c;\u7528\u4e8e\u4e3a\u5df2\u5b58\u5728\u7684\u6570\u636e\u7c7b\u578b\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u522b\u540d\u3002\u5b83\u4e0d\u4f1a\u521b\u5efa\u65b0\u7c7b\u578b&#xff0c;\u53ea\u662f\u8ba9\u4ee3\u7801\u66f4\u7b80\u6d01\u3001\u53ef\u8bfb\u6027\u66f4\u5f3a&#xff0c;\u5c24\u5176\u5728\u5904\u7406\u590d\u6742\u7c7b\u578b&#xff08;\u5982\u7ed3\u6784\u4f53\u3001\u51fd\u6570\u6307\u9488\u3001\u6570\u7ec4\u6307\u9488\u7b49&#xff09;\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<p>\u5f53\u4e0d\u540c\u6e90\u6587\u4ef6\u4e2d\u7528\u5230\u540c\u4e00\u7c7b\u578b\u6570\u636e\u65f6&#xff0c;\u5e38\u7528typedef\u58f0\u660e\u4e00\u4e9b\u6570\u636e\u7c7b\u578b&#xff0c;\u628a\u5b83\u4eec\u5355\u72ec\u653e\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d&#xff0c;\u7136\u540e\u5728\u9700\u8981\u7528\u5230\u5b83\u4eec\u7684\u6587\u4ef6\u4e2d\u7528 #include \u547d\u4ee4\u628a\u4ed6\u4eec\u5305\u542b\u8fdb\u6765\u3002<\/p>\n<p>\u4f7f\u7528typedef \u6709\u5229\u4e8e\u7a0b\u5e8f\u7684\u901a\u7528\u4e0e\u79fb\u690d<\/p>\n<p>typedef \u4e0e #define\u6709\u76f8\u4f3c\u4e4b\u5904&#xff0c;\u4f8b\u5982&#xff1a;typedef int COUNT; #define COUNT int; \u7684\u4f5c\u7528\u90fd\u662f\u7528COUNT \u4ee3\u66ffint.\u4f46\u662f&#xff0c;\u5b83\u4eec\u4e8c\u8005\u662f\u4e0d\u540c\u7684<\/p>\n<p>#define \u662f\u5728\u9884\u7f16\u8bd1\u65f6\u5904\u7406\u7684&#xff0c;\u5b83\u53ea\u80fd\u4f5c\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u66ff\u6362&#xff0c;\u800ctypedef\u662f\u5728\u7f16\u8bd1\u65f6\u5904\u7406\u7684\u3002\u5b9e\u9645\u4e0a\u5b83\u5e76\u4e0d\u662f\u4f5c\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u66ff\u6362&#xff0c;\u800c\u662f\u91c7\u7528\u5982\u540c\u5b9a\u4e49\u53d8\u91cf\u7684\u65b9\u6cd5\u6765\u58f0\u660e\u4e00\u4e2a\u7c7b\u578b<\/p>\n<p>\u57fa\u672c\u8bed\u6cd5 typedef \u5df2\u6709\u7684\u6570\u636e\u7c7b\u578b \u65b0\u7c7b\u578b\u540d\u79f0;<\/p>\n<h3>1.1 \u58f0\u660e\u6574\u578b<\/h3>\n<p>\u58f0\u660e INTEGER \u4e3a \u6574\u578b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">int<\/span> INTEGER<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 punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ INTEGER i&#061;1; \u7b49\u4ef7\u4e8e int i&#061;1;<\/span><br \/>\n    INTEGER i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/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,%d,%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">,<\/span> j<span class=\"token punctuation\">,<\/span> i<span class=\"token operator\">&#043;<\/span>j<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>1.2 \u58f0\u660e\u7ed3\u6784\u4f53\u7c7b\u578b<\/h3>\n<p>\u58f0\u660e date_one \u4e3a DATE \u7ed3\u6784\u4f53\u7c7b\u578b<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3a DATE \u7684\u7ed3\u6784\u4f53\u7c7b\u578b<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">struct<\/span><span class=\"token punctuation\">{<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> month<span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> day<span class=\"token punctuation\">;<\/span><br \/>\n   <span class=\"token keyword\">int<\/span> year<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span>DATE<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 punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u58f0\u660e\u4e86\u4e00\u4e2a DATE \u7c7b\u578b\u7684\u53d8\u91cf date_one;<\/span><br \/>\n    DATE date_one<span class=\"token punctuation\">;<\/span><\/p>\n<p>    date_one<span class=\"token punctuation\">.<\/span>month <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    date_one<span class=\"token punctuation\">.<\/span>day <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">30<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    date_one<span class=\"token punctuation\">.<\/span>year <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2025<\/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;%d-%02d-%02d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    date_one<span class=\"token punctuation\">.<\/span>year<span class=\"token punctuation\">,<\/span> date_one<span class=\"token punctuation\">.<\/span>month<span class=\"token punctuation\">,<\/span> date_one<span class=\"token punctuation\">.<\/span>day<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>1.3 \u58f0\u660e\u6570\u7ec4<\/h3>\n<p>\u58f0\u660e NUM \u4e3a \u6574\u578b\u6570\u7ec4\u7c7b\u578b<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528 typedef \u4e3a int[100] \u5b9a\u4e49\u4e86\u4e00\u4e2a\u65b0\u7684\u7c7b\u578b\u540d NUM<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">int<\/span> NUM<span class=\"token punctuation\">[<\/span><span class=\"token number\">100<\/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 punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    NUM a <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><span class=\"token comment\">\/\/ \u7b49\u4ef7\u4e8e int a[100];<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 400<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>1.4 \u58f0\u660e\u6307\u9488<\/h3>\n<p>\u58f0\u660e SRTING \u4e3a \u5b57\u7b26\u6307\u9488\u7c7b\u578b<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> SRTING<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 punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    SRTING a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ \u7b49\u4ef7\u4e8e char *a, *b;<\/span><\/p>\n<p>    a <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Zhangsan&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    b <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Lisi&#034;<\/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;%d, %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ 8, 8<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s, %s\\\\n&#034;<\/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\">\/\/ Zhangsan, Lisi<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>1.5 \u58f0\u660e\u6570\u7ec4\u6307\u9488<\/h3>\n<p>\u58f0\u660e POINT \u4e3a \u6307\u5411\u6570\u7ec4\u7684\u6307\u9488\u7c7b\u578b(\u6570\u7ec4\u6307\u9488)<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b9a\u4e49\u4e86\u4e00\u4e2a \u6307\u5411\u6570\u7ec4\u7684\u6307\u9488\u7c7b\u578b<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6307\u5411\u4e00\u4e2a\u5305\u542b 3\u4e2aint\u7684\u6570\u7ec4 \u7684\u6307\u9488<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>POINT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\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 \/>\nPOINT p1<span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u7b49\u4ef7\u4e8e int (*p1)[3];<\/span><br \/>\n<span class=\"token keyword\">int<\/span> arr1<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/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 punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\np1 <span class=\"token operator\">&#061;<\/span> arr1<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d, %d, %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> p1<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> p1<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> p1<span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>1.6 \u58f0\u660e\u51fd\u6570\u6307\u9488<\/h3>\n<p>\u58f0\u660e POINT \u4e3a \u6307\u5411\u51fd\u6570\u7684\u6307\u9488\u7c7b\u578b(\u51fd\u6570\u6307\u9488)&#xff0c;\u8be5\u51fd\u6570\u8fd4\u56de\u6574\u578b\u503c<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5b9a\u4e49\u4e86\u4e00\u4e2a \u51fd\u6570\u6307\u9488\u7c7b\u578b, POINT \u662f\u4e00\u4e2a\u7c7b\u578b\u522b\u540d<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>POINT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ \u660e\u786e:\u65e0\u53c2, \u8fd4\u56de int<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">fun<\/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;nian is very handsome\\\\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><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 comment\">\/\/ POINT p1; \u7b49\u4ef7\u4e8e int (*p1)();<\/span><br \/>\n    POINT p1<span class=\"token punctuation\">;<\/span><\/p>\n<p>    p1 <span class=\"token operator\">&#061;<\/span> fun<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><span class=\"token function\">p1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ \u663e\u5f0f\u5ffd\u7565\u8fd4\u56de\u503c<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>1.7 \u58f0\u660e\u679a\u4e3e\u7c7b\u578b<\/h3>\n<p>\u58f0\u660e Bool \u4e3a \u679a\u4e3e\u7c7b\u578b<\/p>\n<p><span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">enum<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    FALSE<span class=\"token punctuation\">,<\/span><br \/>\n    TRUE<br \/>\n<span class=\"token punctuation\">}<\/span>Bool<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528<\/span><br \/>\nBool flag <span class=\"token operator\">&#061;<\/span> TRUE<span class=\"token punctuation\">;<\/span><\/p>\n<h2>\u4e8c\u3001\u5171\u7528\u4f53<\/h2>\n<p>\u5728C\u8bed\u8a00\u4e2d&#xff0c;\u4e0d\u540c\u6570\u636e\u7c7b\u578b\u7684\u6570\u636e\u53ef\u4ee5\u4f7f\u7528\u5171\u540c\u7684\u5b58\u50a8\u533a\u57df&#xff0c;\u8fd9\u79cd\u6570\u636e\u6784\u9020\u7c7b\u578b\u6210\u4e3a\u5171\u540c\u4f53&#xff0c;\u7b80\u79f0\u5171\u4f53&#xff0c;\u53c8\u79f0\u8054\u5408\u4f53\u3002 \u5171\u7528\u4f53\u5728\u5b9a\u4e49&#xff0c;\u8bf4\u660e\u548c\u4f7f\u7528\u5f62\u5f0f\u4e0a\u4e0e\u7ed3\u6784\u4f53\u76f8\u4f3c&#xff0c;\u4e24\u8005\u5728\u672c\u8d28\u4e0a\u7684\u4e0d\u540c\u4ec5\u5728\u4e8e\u4f7f\u7528\u5185\u5b58\u65b9\u5f0f\u4e0a\u3002<\/p>\n<h3>2.1 \u5171\u7528\u4f53\u7684\u5b9a\u4e49<\/h3>\n<p><span class=\"token keyword\">union<\/span> \u5171\u7528\u4f53\u540d <span class=\"token punctuation\">{<\/span><br \/>\n    \u6210\u5458\u5217\u8868<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u793a\u4f8b&#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\">union<\/span> data <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">float<\/span> f<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> str<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 punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u4e2a union data \u4e2d\u7684\u4e09\u4e2a\u6210\u5458 i\u3001f \u548c str \u5171\u4eab\u540c\u4e00\u6bb5\u5185\u5b58&#xff0c;\u5176\u5927\u5c0f\u7b49\u4e8e\u6700\u5927\u6210\u5458\u6240\u9700\u7684\u5185\u5b58 (\u8fd9\u91cc\u662f char[20]&#xff0c;\u6240\u4ee5\u901a\u5e38\u662f 20 \u5b57\u8282)\u3002<\/p>\n<h3>2.2 \u5171\u7528\u4f53 vs \u7ed3\u6784\u4f53<\/h3>\n<table>\n<tr>\u7279\u6027struct&#xff08;\u7ed3\u6784\u4f53&#xff09;union&#xff08;\u5171\u7528\u4f53&#xff09;<\/tr>\n<tbody>\n<tr>\n<td>\u5185\u5b58\u5206\u914d<\/td>\n<td>\u6bcf\u4e2a\u6210\u5458\u72ec\u7acb\u5b58\u50a8&#xff0c;\u603b\u5927\u5c0f \u2265 \u5404\u6210\u5458\u4e4b\u548c&#xff08;\u8003\u8651\u5bf9\u9f50&#xff09;<\/td>\n<td>\u6240\u6709\u6210\u5458\u5171\u4eab\u540c\u4e00\u5757\u5185\u5b58&#xff0c;\u603b\u5927\u5c0f &#061; \u6700\u5927\u6210\u5458\u7684\u5927\u5c0f<\/td>\n<\/tr>\n<tr>\n<td>\u8d4b\u503c\u5f71\u54cd<\/td>\n<td>\u4fee\u6539\u4e00\u4e2a\u6210\u5458\u4e0d\u5f71\u54cd\u5176\u4ed6\u6210\u5458<\/td>\n<td>\u4fee\u6539\u4e00\u4e2a\u6210\u5458\u4f1a\u8986\u76d6\u5176\u4ed6\u6210\u5458\u7684\u503c<\/td>\n<\/tr>\n<tr>\n<td>\u7528\u9014<\/td>\n<td>\u5b58\u50a8\u591a\u4e2a\u76f8\u5173\u6570\u636e<\/td>\n<td>\u5728\u540c\u4e00\u5185\u5b58\u4f4d\u7f6e\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e&#xff08;\u8282\u7701\u7a7a\u95f4\u3001\u7c7b\u578b\u8f6c\u6362\u7b49&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>2.3 \u4f7f\u7528\u793a\u4f8b<\/h3>\n<p>\u6ce8\u610f&#xff1a;\u4efb\u4f55\u65f6\u5019&#xff0c;\u53ea\u80fd\u5b89\u5168\u5730\u8bfb\u53d6\u6700\u8fd1\u5199\u5165\u7684\u90a3\u4e2a\u6210\u5458\u3002\u8bfb\u53d6\u5176\u4ed6\u6210\u5458\u4f1a\u5bfc\u81f4\u672a\u5b9a\u4e49\u884c\u4e3a\u6216\u5783\u573e\u503c\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><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><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;string.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">union<\/span> data<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">float<\/span> f<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> str<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 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 punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">union<\/span> data d1<span class=\"token punctuation\">;<\/span><\/p>\n<p>    d1<span class=\"token punctuation\">.<\/span>i <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;data.i:%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> d1<span class=\"token punctuation\">.<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    d1<span class=\"token punctuation\">.<\/span>f <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;data.f:%.2f\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> d1<span class=\"token punctuation\">.<\/span>f<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">strcpy<\/span><span class=\"token punctuation\">(<\/span>d1<span class=\"token punctuation\">.<\/span>str<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Zhangsan&#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;data.str:%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> d1<span class=\"token punctuation\">.<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5171\u7528\u4f53\u7684\u5927\u5c0f \u8f93\u51fa\u901a\u5e38\u662f 20 (\u56e0\u4e3a char str[20] \u662f\u6700\u5927\u6210\u5458)<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Size of union Data: %zu\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>d1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>2.4 \u5178\u578b\u5e94\u7528\u573a\u666f<\/h3>\n<p>1\u3001\u8282\u7701\u5185\u5b58 \u5f53\u591a\u4e2a\u53d8\u91cf\u4e0d\u4f1a\u540c\u65f6\u4f7f\u7528\u65f6&#xff0c;\u53ef\u7528\u5171\u7528\u4f53\u5171\u4eab\u5185\u5b58\u3002<\/p>\n<p>2\u3001\u7c7b\u578b\u53cc\u5173 \u7528\u4e8e\u5728\u4e0d\u540c\u6570\u636e\u7c7b\u578b\u4e4b\u95f4\u201c\u91cd\u65b0\u89e3\u91ca\u201d\u540c\u4e00\u5757\u5185\u5b58&#xff08;\u9700\u8c28\u614e&#xff01;&#xff09;\u3002<\/p>\n<p><span class=\"token keyword\">union<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">float<\/span> f<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> converter<span class=\"token punctuation\">;<\/span><\/p>\n<p>converter<span class=\"token punctuation\">.<\/span>f <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3.14f<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;As integer: 0x%x\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> converter<span class=\"token punctuation\">.<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u67e5\u770b float \u7684\u4e8c\u8fdb\u5236\u8868\u793a<\/span><\/p>\n<p>3\u3001\u534f\u8bae\u89e3\u6790 \/ \u786c\u4ef6\u5bc4\u5b58\u5668\u8bbf\u95ee \u4f8b\u5982\u89e3\u6790\u7f51\u7edc\u6570\u636e\u5305\u6216\u8bbf\u95ee\u786c\u4ef6\u5bc4\u5b58\u5668\u7684\u4e0d\u540c\u5b57\u6bb5\u3002<\/p>\n<p><span class=\"token keyword\">union<\/span> Register <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">uint32_t<\/span> raw<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">uint32_t<\/span> enable <span class=\"token operator\">:<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">uint32_t<\/span> mode   <span class=\"token operator\">:<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">uint32_t<\/span> value  <span class=\"token operator\">:<\/span> <span class=\"token number\">28<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> bits<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>2.5 \u4e0e\u7ed3\u6784\u4f53\u5d4c\u5957\u4f7f\u7528<\/h3>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">Packet<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> type<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">union<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> int_data<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">float<\/span> float_data<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> msg<span class=\"token punctuation\">[<\/span><span class=\"token number\">32<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> payload<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6839\u636e type \u5b57\u6bb5\u51b3\u5b9a\u8bfb\u53d6 payload \u4e2d\u7684\u54ea\u4e2a\u6210\u5458 \u2014\u2014 \u8fd9\u662f\u5b9e\u73b0\u201c\u53d8\u4f53\u8bb0\u5f55\u201d\u7684\u5e38\u7528\u65b9\u5f0f\u3002<\/p>\n<h3>2.6 \u603b\u7ed3<\/h3>\n<ul>\n<li>\u5171\u7528\u4f53 &#061; \u591a\u4e2a\u6210\u5458\u5171\u4eab\u540c\u4e00\u5185\u5b58<\/li>\n<li>\u5927\u5c0f &#061; \u6700\u5927\u6210\u5458\u7684\u5927\u5c0f&#xff08;\u8003\u8651\u5bf9\u9f50&#xff09;<\/li>\n<li>\u4efb\u4f55\u65f6\u5019\u53ea\u80fd\u5b89\u5168\u4f7f\u7528\u6700\u540e\u4e00\u4e2a\u5199\u5165\u7684\u6210\u5458<\/li>\n<li>\u7528\u9014&#xff1a;\u8282\u7701\u5185\u5b58\u3001\u5e95\u5c42\u6570\u636e\u64cd\u4f5c\u3001\u534f\u8bae\u89e3\u6790\u3001\u786c\u4ef6\u7f16\u7a0b\u7b49<\/li>\n<li>\u98ce\u9669&#xff1a;\u8bef\u8bfb\u672a\u5199\u5165\u7684\u6210\u5458 \u2192 \u5783\u573e\u503c\u6216\u672a\u5b9a\u4e49\u884c\u4e3a<\/li>\n<\/ul>\n<p>\u63d0\u793a&#xff1a;C11 \u5f15\u5165\u4e86 _Generic \u548c\u66f4\u5b89\u5168\u7684\u7c7b\u578b\u5904\u7406&#xff0c;\u4f46\u5728\u8d44\u6e90\u53d7\u9650\u73af\u5883&#xff08;\u5982\u5d4c\u5165\u5f0f&#xff09;&#xff0c;union \u4ecd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002<\/p>\n<h2>\u4e09\u3001\u4f4d\u8fd0\u7b97<\/h2>\n<table>\n<tr>\u8fd0\u7b97\u7b26\u529f\u80fd\u8bf4\u660e\u4e3e\u4f8b<\/tr>\n<tbody>\n<tr>\n<td>~<\/td>\n<td>\u4f4d\u903b\u8f91\u53cd<\/td>\n<td>~a<\/td>\n<\/tr>\n<tr>\n<td>&amp;<\/td>\n<td>\u4f4d\u903b\u8f91\u4e0e<\/td>\n<td>a&amp;b<\/td>\n<\/tr>\n<tr>\n<td>I<\/td>\n<td>\u4f4d\u903b\u8f91\u6216<\/td>\n<td>a I b<\/td>\n<\/tr>\n<tr>\n<td>^<\/td>\n<td>\u4f4d\u903b\u8f91\u5f02\u6216(\u76f8\u540c\u4e3a\u5047&#xff0c;\u4e0d\u540c\u4e3a\u771f)<\/td>\n<td>a^b<\/td>\n<\/tr>\n<tr>\n<td>&gt;&gt;<\/td>\n<td>\u53f3\u79fb\u52a8<\/td>\n<td>a&gt;&gt;b<\/td>\n<\/tr>\n<tr>\n<td>&lt;&lt;<\/td>\n<td>\u5de6\u79fb\u52a8<\/td>\n<td>a&lt;&lt;b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>3.1 \u6309\u4f4d\u4e0e &amp;<\/h3>\n<p>3 &amp; 5 \u5e76\u4e0d\u7b49\u4e8e 8 &#xff0c; \u5e94\u8be5\u662f\u6309\u4f4d\u4e0e\u8fd0\u7b97&#xff1a; 0000 0011 (3) 0000 0101 (5) \u4e00\u4e00\u4e00\u4e00\u4e00\u4e00\u4e00 0000 0001 (1)<\/p>\n<p>\u4e24\u4e2a\u76f8\u5e94\u7684\u4e8c\u8fdb\u5236\u4e2d\u4e24\u4e2a\u90fd\u4e3a1&#xff0c;\u8be5\u4f4d\u7684\u7ed3\u679c\u503c\u4e3a1 \u4e0e0\u8fd0\u7b97\u90fd\u4e3a0&#xff0c;\u4e0e1\u8fd0\u7b97\u4e3a\u672c\u8eab<\/p>\n<p>\u5982\u679c\u53c2\u52a0 &amp; \u8fd0\u7b97\u7684\u662f\u8d1f\u6570&#xff0c;\u5982&#xff08;-3 &amp; -5&#xff09;&#xff0c;\u5219\u8981\u4ee5\u8865\u7801\u5f62\u5f0f\u8868\u793a\u4e3a\u4e8c\u8fdb\u5236\u6570&#xff0c;\u7136\u540e\u518d\u6309\u4f4d\u8fdb\u884c \u201c\u4e0e\u8fd0\u7b97\u201d\u3002<\/p>\n<p>\u6309\u4f4d\u4e0e &amp; \u8fd0\u7b97\u7684\u7528\u9014 1\u3001\u6e05\u96f6 \u82e5\u76f8\u5bf9\u4e00\u4e2a\u5b58\u50a8\u5355\u5143\u6e05\u96f6&#xff0c;\u5373\u4f7f\u5176\u5168\u90e8\u4e8c\u8fdb\u5236\u4f4d\u4e3a0&#xff0c;\u53ea\u8981\u627e\u4e00\u4e2a\u4e8c\u8fdb\u5236\u6570&#xff0c;\u5176\u4e2d\u5404\u4e2a\u4f4d\u7b26\u5408\u4ee5\u4e0b\u6761\u4ef6&#xff1a; \u539f\u6765\u7684\u6570\u4e2d\u4e3a1\u7684\u4f4d&#xff0c;\u65b0\u6570\u4e2d\u76f8\u5e94\u4f4d\u4e3a0&#xff0c;\u7136\u540e\u4f7f\u4e8c\u8005\u8fdb\u884c &amp; \u8fd0\u7b97&#xff0c;\u5373\u53ef\u8fbe\u5230\u6e05\u96f6\u76ee\u7684\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a; \u8981\u6c42\u5c06\u4e8c\u8fdb\u5236\u6570 1110 0101 \u7684\u7b2c\u4e8c\u4f4d\u6e05\u96f6<\/p>\n<p>1110 0101 1111 1011 \u4e00\u4e00\u4e00\u4e00\u4e00\u4e00\u4e00 1110 0001<\/p>\n<p>2\u3001\u53d6\u4e00\u4e2a\u6570\u4e2d\u67d0\u4e9b\u6307\u5b9a\u4f4d \u4f8b\u5982&#xff1a; \u6211\u4eec\u9700\u8981\u5bf9\u4e00\u4e2a\u5b57\u7b26\u6570\u636e\u53d6\u51fa\u5176\u4f4e\u516b\u4f4d\u7684\u503c\u65f6&#xff0c;\u6211\u4eec\u53ef\u4ee5\u8fd9\u4e48\u505a\u3002<\/p>\n<p>11010101 01011011 00000000 11111111 \u4e00\u4e00\u4e00\u4e00\u4e00\u4e00\u4e00\u4e00\u4e00\u4e00 00000000 01011011<\/p>\n<h3>3.2 \u6309\u4f4d\u6216 |<\/h3>\n<p>\u4e24\u4e2a\u76f8\u5e94\u7684\u4e8c\u8fdb\u5236\u4e2d\u53ea\u8981\u6709\u4e00\u4e2a\u4e3a1&#xff0c;\u8be5\u4f4d\u7684\u7ed3\u679c\u503c\u4e3a 1 \u5373&#xff1a;<\/p>\n<p>0 | 0 &#061; 0 &#xff0c;0 | 1 &#061;1 1 | 0 &#061; 1&#xff0c;1 | 1 &#061; 1<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>0011 0000 0000 1111 \u4e00\u4e00\u4e00\u4e00\u4e00 0011 1111<\/p>\n<p>\u7f16\u5199\u4e00\u4e2a\u7a0b\u5e8f&#xff0c;\u5c06\u8f93\u5165\u7684\u5927\u5199\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5c0f\u5199\u5b57\u6bcd&#xff0c;\u8f93\u5165\u7684\u5c0f\u5199\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5927\u5199\u5b57\u6bcd&#xff0c;\u8981\u6c42\u7528\u4f4d\u64cd\u4f5c\u5b8c\u6210\u8f6c\u6362\u8fc7\u7a0b A ASCII : 65 \u5bf9\u5e94\u4e8c\u8fdb\u5236\u4e3a -&gt; 0100 0001 a ASCII : 97 \u5bf9\u5e94\u4e8c\u8fdb\u5236\u4e3a -&gt; 0110 0001<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> ch<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Please enter a letter:&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    ch <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>ch<span class=\"token operator\">&gt;&#061;<\/span><span class=\"token char\">&#039;A&#039;<\/span> <span class=\"token operator\">&amp;&amp;<\/span> ch<span class=\"token operator\">&lt;&#061;<\/span><span class=\"token char\">&#039;Z&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token punctuation\">(<\/span>ch<span class=\"token operator\">&gt;&#061;<\/span><span class=\"token char\">&#039;a&#039;<\/span> <span class=\"token operator\">&amp;&amp;<\/span> ch<span class=\"token operator\">&lt;&#061;<\/span><span class=\"token char\">&#039;z&#039;<\/span><span class=\"token punctuation\">)<\/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;Input error, please re-enter:&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        ch <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ch <span class=\"token operator\">&amp;<\/span> <span class=\"token number\">32<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ 0010 0000 \u5224\u65ad\u662f\u5426\u4e3a\u5c0f\u5199(\u975e\u96f6\u8868\u793a\u5c0f\u5199)<\/span><br \/>\n        ch <span class=\"token operator\">&#061;<\/span> ch <span class=\"token operator\">&amp;<\/span> <span class=\"token number\">223<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 1101 1111 \u6e05\u9664\u7b2c 5 \u4f4d,\u8f6c\u5927\u5199<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        ch <span class=\"token operator\">&#061;<\/span> ch <span class=\"token operator\">|<\/span> <span class=\"token number\">32<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 0010 0000 \u8bbe\u7f6e\u7b2c 5 \u4f4d,\u8f6c\u5c0f\u5199<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">putchar<\/span><span class=\"token punctuation\">(<\/span>ch<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    ch <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getchar<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">putchar<\/span><span class=\"token punctuation\">(<\/span>ch<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.3 \u5f02\u6216 ^<\/h3>\n<p>\u4e0e 0 \u5f02\u6216\u4fdd\u7559\u539f\u503c&#xff0c;\u4e0e 1 \u5f02\u6216\u53d6\u53cd \u5f02\u6216\u8fd0\u7b97\u7b26 ^ \u4e5f\u79f0 XOR\u8fd0\u7b97\u7b26 \u5b83\u7684\u89c4\u5219\u662f&#xff1a;\u82e5\u53c2\u52a0\u8fd0\u7b97\u7684\u662f\u4e24\u4e2a\u4e8c\u8fdb\u5236\u4f4d\u540c\u53f7\u5219\u7ed3\u679c\u4e3a0(\u5047), \u5f02\u53f7\u5219\u4e3a1(\u771f)<\/p>\n<p>\u5373&#xff1a; 0 ^ 0 &#061; 0, 0 ^ 1 &#061; 1 1 ^ 0 &#061; 1, 1 ^ 1 &#061; 0<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p>0011 1001 0010 1010 \u4e00\u4e00\u4e00\u4e00\u4e00 0001 0011<\/p>\n<p>1\u3001\u4f7f\u7279\u5b9a\u4f4d\u7ffb\u8f6c \u8bbe\u6709 0111 1010&#xff0c;\u60f3\u4f7f\u5176\u4f4e\u56db\u4f4d\u7ffb\u8f6c&#xff0c;\u5373 1 \u53d8\u4e3a0 &#xff0c;0 \u53d8\u62101\u3002\u53ef\u4ee5\u5c06\u5b83\u4e0e 0000 1111 \u8fdb\u884c ^ \u8fd0\u7b97&#xff0c;\u5373(\u7ffb\u8f6c\u4f4d\u4e0e 1 \u5f02\u6216\u53d6\u53cd)&#xff1a;<\/p>\n<p>0111 1010 0000 1111 \u4e00\u4e00\u4e00\u4e00\u4e00 0111 0101<\/p>\n<p>2\u3001\u4e0e 0 \u5f02\u6216 ^ &#xff0c;\u4fdd\u7559\u539f\u503c \u4f8b\u5982&#xff1a;<\/p>\n<p>0000 1010 0000 0000 \u4e00\u4e00\u4e00\u4e00\u4e00 0000 1010<\/p>\n<p>\u56e0\u4e3a\u539f\u6570\u4e2d\u76841 \u4e0e 0 \u8fdb\u884c ^\u8fd0\u7b97\u5f971&#xff0c; 0 ^ 0 \u5f970&#xff0c;\u6545\u4fdd\u7559\u539f\u6570\u3002<\/p>\n<p>3\u3001\u4ea4\u6362\u4e24\u4e2a\u503c&#xff0c;\u4e0d\u7528\u4e34\u65f6\u53d8\u91cf \u4f8b\u5982&#xff1a; a&#061;3,b &#061; 4 &#xff0c;\u73b0\u5728\u60f3\u8981\u5c06 a,b \u53d8\u91cf\u7684\u503c\u4ea4\u6362\u4f4d\u7f6e a &#061; a ^ b; b &#061; b ^ a; a &#061; a ^ b; \u8fd9\u79cd\u65b9\u6cd5\u4e5f\u5e38\u7528\u4e8e\u52a0\u5bc6\u7b97\u6cd5<\/p>\n<h3>3.4 \u53d6\u53cd\u8fd0\u7b97\u7b26 ~<\/h3>\n<p>~ \u662f\u4e00\u4e2a\u5355\u76ee\u8fd0\u7b97\u7b26&#xff0c;\u7528\u6765\u5bf9\u4e00\u4e2a\u4e8c\u8fdb\u5236\u6570\u6309\u4f4d\u53d6\u53cd&#xff0c;\u5373\u5c06 0 \u53d8\u62101&#xff0c;\u5c061\u53d8\u62100&#xff1b; \u4f8b\u5982&#xff1a;~ 025 \u662f\u5bf9\u516b\u8fdb\u5236\u6570 25 (\u4e8c\u8fdb\u5236 0001 0101)\u6309\u4f4d\u53d6\u53cd<\/p>\n<p>0001 0101 \u4e00\u4e00\u4e00\u4e00\u4e00 1110 1010<\/p>\n<h3>3.5 \u5de6\u79fb\u8fd0\u7b97\u7b26 &lt;&lt;<\/h3>\n<p>\u5de6\u79fb\u8fd0\u7b97\u7b26\u662f\u7528\u6765\u5c06\u4e00\u4e2a\u6570\u7684\u5404\u4e8c\u8fdb\u5236\u4f4d\u5168\u90e8\u5de6\u79fb\u82e5\u5e72\u4f4d\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a; a &#061; &lt;&lt; 2 \u5c06a\u7684\u4e8c\u8fdb\u5236\u6570\u5de6\u79fb2 \u4f4d&#xff0c;\u53f3\u8fb9\u88650. \u82e5 a &#061; 15&#xff0c; \u5373\u4e8c\u8fdb\u5236\u6570 0000 1111&#xff0c;\u5de6\u79fb2\u4f4d\u5f97&#xff0c; 0011 1100&#xff08;\u5341\u8fdb\u5236\u657060&#xff09;\u3002 \u82e5\u9ad8\u4f4d\u5de6\u79fb\u540e\u6ea2\u51fa&#xff0c;\u820d\u5f03\u3002<\/p>\n<p>\u5de6\u79fbn\u4f4d\u76f8\u5f53\u4e8e\u8be5\u6570\u4e58\u4ee52^n<\/p>\n<p>\u5de6\u79fb1\u4f4d\u76f8\u5f53\u4e8e\u8be5\u6570\u4e58\u4ee52&#xff0c;\u5de6\u79fb2\u4f4d\u76f8\u5f53\u4e8e\u8be5\u6570\u4e58\u4ee54&#xff0c;15&lt;&lt;2 &#061; 60,\u5373\u4e58\u4e864 (2\u76842\u6b21\u65b9) \u4f46\u6b64\u7ed3\u8bba\u53ea\u9002\u7528\u4e8e\u8be5\u6570\u5de6\u79fb\u65f6\u88ab\u6ea2\u51fa\u820d\u5f03\u7684\u9ad8\u4f4d\u4e2d\u4e0d\u5305\u542b1\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u5047\u8bbe\u4e00\u4e2a\u5b57\u8282&#xff08;8&#xff09;\u4f4d\u5b58\u4e00\u4e2a\u6574\u6570&#xff0c;\u82e5a\u4e3a\u65e0\u7b26\u53f7\u6574\u578b\u53d8\u91cf&#xff0c;\u5219a &#061; 64\u65f6&#xff0c;\u5de6\u79fb1\u4f4d\u65f6\u6ea2\u51fa\u7684\u662f0&#xff0c;\u800c\u5de6\u79fb2\u4f4d\u65f6&#xff0c;\u6ea2\u51fa\u7684\u9ad8\u4f4d\u4e2d\u5305\u542b1\u3002<\/p>\n<p>64\u539f:0100 0000 \u5de6\u79fb1\u4f4d:0100 0000 \u5de6\u79fb2\u4f4d:0000 0000<\/p>\n<h3>3.6 \u53f3\u79fb\u8fd0\u7b97\u7b26 &gt;&gt;<\/h3>\n<p>\u53f3\u79fb\u8fd0\u7b97\u7b26\u662fa &gt;&gt;2\u8868\u793a\u5c06a\u7684\u5404\u4e8c\u8fdb\u5236\u4f4d\u53f3\u79fb2\u4f4d&#xff0c;\u79fb\u5230\u53f3\u7aef\u7684\u4f4e\u4f4d\u88ab\u820d\u5f03&#xff0c;\u5bf9\u65e0\u7b26\u53f7\u6570&#xff0c;\u9ad8\u4f4d\u88650\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a; a &#061; 017\u65f6&#xff0c; a\u7684\u503c\u7528\u4e8c\u8fdb\u5236\u5f62\u5f0f\u8868\u793a\u4e3a 0000 1111&#xff0c;\u820d\u5f03\u4f4e2\u4f4d11&#xff0c;\u5f97\u5230&#xff1a;a&gt;&gt;2 &#061;&#061; 0000 0011<\/p>\n<p>\u53f3\u79fb\u4e00\u4f4d\u76f8\u5f53\u4e8e\u9664\u4ee52 \u53f3\u79fbn\u4f4d\u76f8\u5f53\u4e8e\u9664\u4e8e2^n<\/p>\n<p>\u53f3\u79fb\u79fb\u52a8&#xff0c;\u9700\u8981\u6ce8\u610f\u7b26\u53f7\u4f4d\u95ee\u9898&#xff1a; 1\u3001\u5bf9\u65e0\u7b26\u53f7\u6570&#xff0c;\u53f3\u79fb\u65f6\u5de6\u8fb9\u9ad8\u4f4d\u79fb\u51650&#xff1b;<\/p>\n<p>2\u3001\u5bf9\u4e8e\u6709\u7b26\u53f7\u7684\u503c&#xff0c;\u5982\u679c\u539f\u6765\u7b26\u53f7\u4f4d\u4e3a0 (\u8be5\u6570\u4e3a\u6b63)&#xff0c;\u5219\u5de6\u8fb9\u4e5f\u662f\u79fb\u51650 \u5982\u679c\u7b26\u53f7\u4f4d\u539f\u6765\u4f4d1&#xff08;\u5373\u8d1f\u53f7&#xff09;&#xff0c;\u5219\u5de6\u8fb9\u79fb\u51650\u8fd8\u662f1&#xff0c;\u8981\u53d6\u51b3\u4e8e\u6240\u7528\u7684\u8ba1\u7b97\u673a\u7cfb\u7edf\u3002\u6709\u7684\u7cfb\u7edf\u79fb\u51650&#xff0c;\u6709\u7684\u7cfb\u7edf\u79fb\u51651\u3002 \u79fb\u51650\u7684\u79f0\u4e3a \u201c\u903b\u8f91\u53f3\u79fb\u201d&#xff0c;\u5373\u7b80\u5355\u53f3\u79fb&#xff1b;\u79fb\u51651\u7684\u79f0\u4e3a\u201c\u7b97\u672f\u53f3\u79fb\u201d\u3002<\/p>\n<p>\u4f8b&#xff1a; a \u7684\u503c\u662f\u5341\u8fdb\u5236\u6570 -2&#xff1b; a &#061;&#061; 1111 1110&#xff08;\u4e8c\u8fdb\u5236&#xff09; \u65e0\u7b26\u53f7\u6570&#xff1a;a&gt;&gt;1 :0111 1111(\u903b\u8f91\u53f3\u79fb) \u6709\u7b26\u53f7\u6570&#xff1a;a&gt;&gt;1 :1111 1111(\u7b97\u672f\u53f3\u79fb)<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n     <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ 1111 1110<\/span><br \/>\n     a <span class=\"token operator\">&#061;<\/span> a<span class=\"token operator\">&gt;&gt;<\/span><span class=\"token number\">1<\/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\">\/\/ 0111 1111 (127)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n     <span class=\"token keyword\">char<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ 1111 1110<\/span><br \/>\n     a <span class=\"token operator\">&#061;<\/span> a<span class=\"token operator\">&gt;&gt;<\/span><span class=\"token number\">1<\/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\">\/\/ 1111 1111 (-1)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.7 \u8d4b\u503c\u8fd0\u7b97\u7b26<\/h3>\n<p>\u4f4d\u8fd0\u7b97\u7b26\u4e0e\u8d4b\u503c\u8fd0\u7b97\u7b26\u53ef\u4ee5\u7ec4\u6210\u590d\u5408\u8d4b\u503c\u8fd0\u7b97\u7b26\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a; &amp;&#061; , |&#061; , &gt;&gt;&#061; , &lt;&lt;&#061; , ^ &#061;<\/p>\n<p>a &amp;&#061; b \u76f8\u5f53\u4e8e a &#061; a &amp; b a &lt;&lt;&#061; 2 \u76f8\u5f53\u4e8e a &#061; a &lt;&lt; 2<\/p>\n<p>\u4f8b1&#xff1a;\u53d6\u4e00\u4e2a char a \u4ece\u53f3\u7aef\u5f00\u59cb\u7684 2-5\u4f4d&#xff1a; \u2460\u5148\u4f7fa \u53f3\u79fb 2\u4f4d &#xff1a; a&gt;&gt;2 \u76ee\u7684\u662f\u4f7f\u8981\u53d6\u51fa\u7684\u90a3\u51e0\u4f4d\u79fb\u5230\u6700\u53f3\u7aef \u2461\u8bbe\u7f6e\u4e00\u4e2a\u4f4e\u56db\u4f4d\u5168\u4e3a1&#xff0c;\u5176\u4f59\u5168\u4e3a0\u7684\u6570\u3002 ~ (~0 &lt;&lt; 4) \/\/ 0000 1111 \u2462\u5c06\u4e0a\u9762 \u2460 \u2461\u8fdb\u884c &amp;\u8fd0\u7b97 (a &gt;&gt; 2) &amp; (~ 0 &lt;&lt;4 )<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> c<span class=\"token punctuation\">,<\/span> d<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Please enter the array to be validated:&#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&#034;<\/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    b <span class=\"token operator\">&#061;<\/span> a<span class=\"token operator\">&gt;&gt;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    c <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">~<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">~<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ ~(1111 1111 &lt;&lt; 4) &#061;&#061; 0000 1111<\/span><br \/>\n    d <span class=\"token operator\">&#061;<\/span> b <span class=\"token operator\">&amp;<\/span> c<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> d<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8f93\u516523  0001 0111 \u53f3\u79fb2\u4f4d 0000 0101 \u7ed3\u679c 5 <\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f8b2&#xff1a;\u8981\u6c42\u5c06 a \u8fdb\u884c\u53f3\u5faa\u73af\u79fb\u4f4d <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260124173220-69750224f1853.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> c<span class=\"token punctuation\">,<\/span> d<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> n<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Please enter the number to achieve circular right shift:\\\\n&#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&#034;<\/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;Please input the number of bits to be shifted right:\\\\n&#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&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    b <span class=\"token operator\">&#061;<\/span> a<span class=\"token operator\">&lt;&lt;<\/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 punctuation\">)<\/span><span class=\"token operator\">*<\/span><span class=\"token number\">8<\/span> <span class=\"token operator\">&#8211;<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u53d6\u51faa\u7684\u6700\u540en\u4f4d,\u5de6\u79fb\u5230\u6700\u524d\u9762,\u53f3\u8fb9\u88650<\/span><br \/>\n    c <span class=\"token operator\">&#061;<\/span> a<span class=\"token operator\">&gt;&gt;<\/span>n<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ a\u53f3\u79fbn\u4f4d, \u5de6\u8fb9\u88650<\/span><br \/>\n    d <span class=\"token operator\">&#061;<\/span> b <span class=\"token operator\">|<\/span> c<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ \u5b9e\u73b0\u53f3\u5faa\u73af\u79fb\u4f4d<\/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> d<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ 23 3 226<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>\u56db\u3001 \u4f4d\u6bb5<\/h2>\n<p>\u4fe1\u606f\u7684\u5b58\u53d6\u4e00\u822c\u4ee5\u5b57\u8282\u4f4d\u5355\u4f4d&#xff0c;\u5b9e\u9645\u4e0a&#xff0c;\u6709\u65f6\u5b58\u50a8\u4e00\u4e2a\u4fe1\u606f\u4e0d\u5fc5\u7528\u4e00\u4e2a\u6216\u591a\u4e2a\u5b57\u8282\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;\u201c\u771f\u201d\u6216 \u201c\u5047\u201d\u75280\u62161\u8868\u793a&#xff0c;\u53ea\u9700 1 \u4f4d\u5373\u53ef\u3002<\/p>\n<p>\u5728\u8ba1\u7b97\u673a\u7528\u4e8e\u8fc7\u7a0b\u63a7\u5236&#xff0c;\u53c2\u6570\u68c0\u6d4b\u6216\u6570\u636e\u901a\u4fe1\u9886\u57df\u65f6&#xff0c;\u63a7\u5236\u4fe1\u606f\u5f80\u5f80\u53ea\u5360\u4e00\u4e2a\u5b57\u8282\u4e2d\u7684\u4e00\u4e2a\u6216\u51e0\u4e2a\u4e8c\u8fdb\u5236\u4f4d&#xff0c;\u5e38\u5e38\u5728\u4e00\u4e2a\u5b57\u8282\u4e2d\u653e\u51e0\u4e2a\u4fe1\u606f\u3002<\/p>\n<p>C\u8bed\u8a00\u5141\u8bb8\u5728\u4e00\u4e2a\u7ed3\u6784\u4f53\u4e2d\u4ee5\u4f4d\u4e3a\u5355\u4f4d\u6765\u6307\u5b9a\u5176\u6210\u5458\u6240\u5360\u5185\u5b58\u957f\u5ea6&#xff0c;\u8fd9\u79cd\u4ee5\u4f4d\u4e3a\u5355\u4f4d\u7684\u6210\u5458\u79f0\u4e3a&#034;\u4f4d\u6bb5 &#034;\u6216\u79f0&#034;\u4f4d\u57df &#034;&#xff0c;\u5229\u7528\u4f4d\u6bb5\u80fd\u591f\u7528\u8f83\u5c11\u7684\u4f4d\u6570\u5b58\u50a8\u6570\u636e\u3002<\/p>\n<p>\u5185\u5b58\u5e03\u5c40&#xff08;\u4ee5 GCC \/ Clang on x86-64 \u4e3a\u4f8b&#xff09;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">packed<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> a<span class=\"token operator\">:<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5360 bit0&#xff5e;bit1<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> b<span class=\"token operator\">:<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5360 bit2&#xff5e;bit7 \u2192 \u4e0e a \u5171\u4eab\u7b2c 1 \u4e2a\u5b57\u8282<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> c<span class=\"token operator\">:<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5360 bit0&#xff5e;bit3(\u65b0\u5b57\u8282\u5f00\u59cb?\u4e0d\u4e00\u5b9a!)<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> d<span class=\"token operator\">:<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5360 bit4&#xff5e;bit7 \u2192 \u4e0e c \u5171\u4eab\u7b2c 2 \u4e2a\u5b57\u8282<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ 4 \u5b57\u8282, \u901a\u5e38\u4ece 4 \u5b57\u8282\u5bf9\u9f50\u5730\u5740\u5f00\u59cb <\/span><br \/>\n<span class=\"token punctuation\">}<\/span>data<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5185\u5b58\u5e03\u5c40&#xff08;\u5c0f\u7aef&#xff0c;GCC \u9ed8\u8ba4&#xff09;:<\/p>\n<table>\n<tr>\u5b57\u8282\u504f\u79fb\u4f4d&#xff08;7 \u2026 0&#xff09;\u6210\u5458<\/tr>\n<tbody>\n<tr>\n<td>0<\/td>\n<td>b[5:0] a[1:0]<\/td>\n<td>a(2\u4f4d), b(6\u4f4d)<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>d[3:0] c[3:0]<\/td>\n<td>c(4\u4f4d), d(4\u4f4d)<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>&#xff08;\u586b\u5145&#xff09;<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>&#xff08;\u586b\u5145&#xff09;<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>4&#xff5e;7<\/td>\n<td>i&#xff08;4\u5b57\u8282\u6574\u6570&#xff09;<\/td>\n<td>int i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6240\u4ee5&#xff1a; \u7b2c\u4e00\u4e2a\u5b57\u8282&#xff1a;\u4f4e2\u4f4d\u662f a&#xff0c;\u9ad86\u4f4d\u662f b \u7b2c\u4e8c\u4e2a\u5b57\u8282&#xff1a;\u4f4e4\u4f4d\u662f c&#xff0c;\u9ad84\u4f4d\u662f d<\/p>\n<p>1\u3001\u4f4d\u6bb5\u6210\u5458\u7684\u7c7b\u578b\u5fc5\u987b\u6307\u5b9a\u4e3a unsigned \u6216 int\u7c7b\u578b\u3002 2\u3001\u82e5\u67d0\u4e00\u4f4d\u6bb5\u8981\u4ece\u53e6\u4e00\u4e2a\u5b57\u5f00\u59cb\u5b58\u653e&#xff0c;\u53ef\u7528\u4ee5\u4e0b\u5f62\u5f0f\u5b9a\u4e49&#xff1a;<\/p>\n<p><span class=\"token keyword\">unsigned<\/span> a<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> b<span class=\"token operator\">:<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span> \u4e00\u4e2a\u5b58\u50a8\u5355\u5143<br \/>\n<span class=\"token keyword\">unsigned<\/span>  <span class=\"token operator\">:<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> c<span class=\"token operator\">:<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span> \u53e6\u4e00\u5b58\u50a8\u5355\u5143<\/p>\n<p>a\u3001b\u3001c \u5e94\u8fde\u7eed\u5b58\u653e\u5728\u4e00\u4e2a\u5b58\u50a8\u5355\u5143\u4e2d&#xff0c;\u7531\u4e8e\u7528\u4e86\u957f\u5ea6\u4e3a0\u7684\u4f4d\u6bb5&#xff0c;\u5176\u4f5c\u7528\u662f\u4f7f\u4e0b\u4e00\u4e2a\u4f4d\u6bb5\u4ece\u4e0b\u4e00\u4e2a\u5b58\u50a8\u5355\u5143\u5f00\u59cb\u5b58\u653e\u3002\u56e0\u6b64&#xff0c;\u53ea\u5c06 a\u3001b \u5b58\u50a8\u5728\u4e00\u4e2a\u5b58\u50a8\u5355\u5143\u4e2d&#xff0c;c \u53e6\u5b58\u5728\u4e0b\u4e00\u4e2a\u5355\u5143&#xff08;\u5b58\u50a8\u5355\u5143\u53ef\u80fd\u662f\u4e00\u4e2a\u5b57\u8282&#xff0c;\u4e5f\u53ef\u80fd\u662f\u4e24\u4e2a\u5b57\u8282&#xff0c;\u89c6\u4e0d\u540c\u7684\u7f16\u8bd1\u7cfb\u7edf\u800c\u5f02&#xff09;\u3002<\/p>\n<p>3\u3001\u4e00\u4e2a\u4f4d\u6bb5\u5fc5\u987b\u5b58\u50a8\u5728\u540c\u4e00\u5b58\u50a8\u5355\u5143\u4e2d&#xff0c;\u4e0d\u80fd\u8de8\u4e24\u4e2a\u5355\u5143\u3002\u5982\u679c\u7b2c\u4e00\u4e2a\u5355\u5143\u7a7a\u95f4\u4e0d\u80fd\u5bb9\u7eb3\u4e0b\u4e00\u4e2a\u4f4d\u6bb5&#xff0c;\u5219\u8be5\u7a7a\u95f4\u4e0d\u7528&#xff0c;\u800c\u4ece\u4e0b\u4e00\u4e2a\u5355\u5143\u8d77\u5b58\u653e\u8be5\u4f4d\u6bb5\u3002 4\u3001\u53ef\u4ee5\u5b9a\u4e49\u65e0\u540d\u4f4d\u6bb5\u3002 5\u3001\u4f4d\u6bb5\u7684\u957f\u5ea6\u4e0d\u80fd\u5927\u4e8e\u5b58\u50a8\u5355\u5143\u7684\u957f\u5ea6&#xff0c;\u4e5f\u4e0d\u80fd\u5b9a\u4e49\u4f4d\u6bb5\u6570\u7ec4\u3002 6\u3001\u4f4d\u6bb5\u53ef\u4ee5\u7528\u6574\u578b\u683c\u5f0f\u7b26\u8f93\u51fa\u3002 7\u3001\u4f4d\u6bb5\u53ef\u4ee5\u5728\u6570\u503c\u8868\u8fbe\u5f0f\u4e2d\u5f15\u7528&#xff0c;\u5b83\u4f1a\u88ab\u7cfb\u7edf\u81ea\u52a8\u5730\u8f6c\u6362\u6210\u6574\u578b\u6570\u3002<\/p>\n<h2>\u4e94\u3001\u679a\u4e3e\u7c7b\u578b<\/h2>\n<p>\u5728 C \u8bed\u8a00\u4e2d&#xff0c;\u679a\u4e3e\u7c7b\u578b \u662f\u4e00\u79cd\u7528\u6237\u81ea\u5b9a\u4e49\u7684\u6570\u636e\u7c7b\u578b&#xff0c;\u7528\u4e8e\u5b9a\u4e49\u4e00\u7ec4\u547d\u540d\u7684\u6574\u578b\u5e38\u91cf\u3002\u5b83\u8ba9\u4ee3\u7801\u66f4\u5177\u53ef\u8bfb\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u548c\u5b89\u5168\u6027\u3002<\/p>\n<h3>5.1 \u57fa\u672c\u8bed\u6cd5<\/h3>\n<p><span class=\"token keyword\">enum<\/span> \u679a\u4e3e\u540d <span class=\"token punctuation\">{<\/span><br \/>\n    \u679a\u4e3e\u5e38\u91cf<span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    \u679a\u4e3e\u5e38\u91cf<span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    \u679a\u4e3e\u5e38\u91cf<span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">.<\/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>\u793a\u4f8b&#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\">enum<\/span> <span class=\"token class-name\">Color<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    RED<span class=\"token punctuation\">,<\/span><br \/>\n    GREEN<span class=\"token punctuation\">,<\/span><br \/>\n    BLUE<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 punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">Color<\/span> a <span class=\"token operator\">&#061;<\/span> RED<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">Color<\/span> b <span class=\"token operator\">&#061;<\/span> GREEN<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">Color<\/span> c <span class=\"token operator\">&#061;<\/span> BLUE<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;RED &#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\u51fa: RED &#061; 0<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;GREEN &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa: GREEN &#061; 1<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;BLUE &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> c<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa: BLUE &#061; 2<\/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>5.2 \u679a\u4e3e\u5e38\u91cf\u7684\u503c<\/h3>\n<p>1\u3001\u9ed8\u8ba4\u4ece 0 \u5f00\u59cb&#xff0c;\u4f9d\u6b21\u9012\u589e 1\u3002 2\u3001\u53ef\u4ee5\u663e\u5f0f\u6307\u5b9a\u503c&#xff0c;\u540e\u7eed\u672a\u6307\u5b9a\u7684\u5e38\u91cf\u4ece\u8be5\u503c\u7ee7\u7eed\u9012\u589e\u3002 \u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">Status<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    OFF <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>      <span class=\"token comment\">\/\/ 0<\/span><br \/>\n    ON<span class=\"token punctuation\">,<\/span>           <span class=\"token comment\">\/\/ 1&#xff08;\u81ea\u52a8 &#061; 0 &#043; 1&#xff09;<\/span><br \/>\n    PENDING <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ 5<\/span><br \/>\n    ERROR         <span class=\"token comment\">\/\/ 6&#xff08;\u81ea\u52a8 &#061; 5 &#043; 1&#xff09;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>OFF&#061;0, ON&#061;1, PENDING&#061;5, ERROR&#061;6<\/p>\n<h3>5.3 \u5b9a\u4e49\u679a\u4e3e\u53d8\u91cf<\/h3>\n<p>\u6709\u4e09\u79cd\u65b9\u5f0f&#xff1a;<\/p>\n<h4>5.3.1 \u5148\u5b9a\u4e49\u7c7b\u578b&#xff0c;\u518d\u58f0\u660e\u53d8\u91cf<\/h4>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">Week<\/span><span class=\"token punctuation\">{<\/span><br \/>\nMON<span class=\"token punctuation\">,<\/span><br \/>\nTUE<span class=\"token punctuation\">,<\/span><br \/>\nWED<br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">Week<\/span> today <span class=\"token operator\">&#061;<\/span> TUE<span class=\"token punctuation\">;<\/span><\/p>\n<h4>5.3.2 \u5b9a\u4e49\u7c7b\u578b\u7684\u540c\u65f6\u58f0\u660e\u53d8\u91cf<\/h4>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">Week<\/span><span class=\"token punctuation\">{<\/span><br \/>\nMON<span class=\"token punctuation\">,<\/span><br \/>\nTUE<span class=\"token punctuation\">,<\/span><br \/>\nWED<br \/>\n<span class=\"token punctuation\">}<\/span>today<span class=\"token punctuation\">,<\/span> tomorrow<span class=\"token punctuation\">;<\/span><\/p>\n<h4>5.3.3 \u533f\u540d\u679a\u4e3e&#xff08;\u4e0d\u63a8\u8350&#xff0c;\u9664\u975e\u53ea\u7528\u4e00\u6b21&#xff09;<\/h4>\n<p><span class=\"token keyword\">enum<\/span><span class=\"token punctuation\">{<\/span><br \/>\nMON<span class=\"token punctuation\">,<\/span><br \/>\nTUE<span class=\"token punctuation\">,<\/span><br \/>\nWED<br \/>\n<span class=\"token punctuation\">}<\/span>day <span class=\"token operator\">&#061;<\/span> MON<span class=\"token punctuation\">;<\/span><\/p>\n<h3>5.4 \u4f7f\u7528 typedef \u7b80\u5316<\/h3>\n<p>\u907f\u514d\u6bcf\u6b21\u5199 enum Name&#xff0c;\u53ef\u7528 typedef \u521b\u5efa\u522b\u540d&#xff1a;<\/p>\n<p><span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">enum<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    FALSE<span class=\"token punctuation\">,<\/span><br \/>\n    TRUE<br \/>\n<span class=\"token punctuation\">}<\/span>Bool<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528<\/span><br \/>\nBool flag <span class=\"token operator\">&#061;<\/span> TRUE<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u662f C \u8bed\u8a00\u4e2d\u6a21\u62df\u5e03\u5c14\u7c7b\u578b\u7684\u7ecf\u5178\u65b9\u6cd5&#xff08;C99 \u540e\u6709 _Bool \u548c &lt;stdbool.h&gt;&#xff09;\u3002<\/p>\n<h3>5.5 \u679a\u4e3e\u7684\u672c\u8d28<\/h3>\n<p>1\u3001\u679a\u4e3e\u5e38\u91cf\u662f int \u7c7b\u578b\u7684\u7f16\u8bd1\u65f6\u5e38\u91cf\u3002 2\u3001\u679a\u4e3e\u53d8\u91cf\u5728\u5185\u5b58\u4e2d\u901a\u5e38\u4ee5 int \u5927\u5c0f\u5b58\u50a8&#xff08;\u4f46\u6807\u51c6\u672a\u5f3a\u5236&#xff0c;\u67d0\u4e9b\u7f16\u8bd1\u5668\u53ef\u4f18\u5316\u4e3a\u66f4\u5c0f\u7c7b\u578b&#xff09;\u3002 3\u3001\u53ef\u4ee5\u5bf9\u679a\u4e3e\u53d8\u91cf\u8fdb\u884c\u6574\u6570\u8fd0\u7b97&#xff08;\u4f46\u4e0d\u63a8\u8350&#xff0c;\u4f1a\u7834\u574f\u7c7b\u578b\u5b89\u5168&#xff09;\u3002 \u793a\u4f8b&#xff08;\u5408\u6cd5\u4f46\u4e0d\u63a8\u8350&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">Color<\/span> c <span class=\"token operator\">&#061;<\/span> RED<span class=\"token punctuation\">;<\/span><br \/>\nc <span class=\"token operator\">&#061;<\/span> c <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ c \u53d8\u6210 GREEN&#xff08;\u5371\u9669&#xff01;\u53ef\u80fd\u8d8a\u754c&#xff09;<\/span><\/p>\n<h3>5.6 \u5178\u578b\u5e94\u7528\u573a\u666f<\/h3>\n<h4>5.6.1 \u72b6\u6001\u673a<\/h4>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">State<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    IDLE<span class=\"token punctuation\">,<\/span><br \/>\n    RUNNING<span class=\"token punctuation\">,<\/span><br \/>\n    PAUSED<span class=\"token punctuation\">,<\/span><br \/>\n    STOPPED<br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">State<\/span> current <span class=\"token operator\">&#061;<\/span> IDLE<span class=\"token punctuation\">;<\/span><\/p>\n<h4>5.6.2 \u9009\u9879\/\u6a21\u5f0f\u9009\u62e9<\/h4>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">FileMode<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    READ_ONLY<span class=\"token punctuation\">,<\/span><br \/>\n    WRITE_ONLY<span class=\"token punctuation\">,<\/span><br \/>\n    READ_WRITE<br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>5.6.3 \u9519\u8bef\u7801<\/h4>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">ErrorCode<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    SUCCESS <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    FILE_NOT_FOUND <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    PERMISSION_DENIED <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>5.7 \u6ce8\u610f\u4e8b\u9879<\/h3>\n<table>\n<tr>\u95ee\u9898\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u4e0d\u662f\u7c7b\u578b\u5b89\u5168<\/td>\n<td>C \u7684 enum \u672c\u8d28\u662f int&#xff0c;\u53ef\u4ee5\u8d4b\u4efb\u610f\u6574\u6570\u503c&#xff1a;enum Color c &#061; 999; \u2705&#xff08;\u7f16\u8bd1\u901a\u8fc7&#xff0c;\u4f46\u903b\u8f91\u9519\u8bef&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u4e0d\u80fd\u76f4\u63a5\u8f93\u5165\/\u8f93\u51fa\u540d\u5b57<\/td>\n<td>printf(&#034;%s&#034;, RED) \u274c \u4e0d\u884c&#xff01;\u9700\u8981\u624b\u52a8\u6620\u5c04&#xff08;\u89c1\u4e0b\u6587\u6280\u5de7&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u4f5c\u7528\u57df<\/td>\n<td>C89 \u4e2d\u679a\u4e3e\u5e38\u91cf\u662f\u5168\u5c40\u4f5c\u7528\u57df&#xff0c;\u53ef\u80fd\u51b2\u7a81&#xff1b;C \u6ca1\u6709\u201c\u679a\u4e3e\u7c7b\u201d&#xff08;\u50cf C&#043;&#043; \u7684 enum class&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>5.8 \u5b9e\u7528\u6280\u5de7&#xff1a;\u5c06\u679a\u4e3e\u503c\u8f6c\u4e3a\u5b57\u7b26\u4e32<\/h3>\n<p>C \u8bed\u8a00\u4e0d\u652f\u6301\u53cd\u5c04&#xff0c;\u4f46\u53ef\u4ee5\u7528\u5b8f\u6216\u6570\u7ec4\u6a21\u62df&#xff1a; \u65b9\u6cd5&#xff1a;\u5b57\u7b26\u4e32\u6570\u7ec4\u6620\u5c04<\/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\">enum<\/span> <span class=\"token class-name\">Color<\/span><span class=\"token punctuation\">{<\/span><br \/>\nRED<span class=\"token punctuation\">,<\/span><br \/>\nGREEN<span class=\"token punctuation\">,<\/span><br \/>\nBLUE<span class=\"token punctuation\">,<\/span><br \/>\nCOLOR_MAX<br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>color_names<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;RED&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;GREEN&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;BLUE&#034;<\/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 punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">Color<\/span> c <span class=\"token operator\">&#061;<\/span> GREEN<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Color: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> color_names<span class=\"token punctuation\">[<\/span>c<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa: Color: GREEN<\/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>\u8981\u6c42\u679a\u4e3e\u4ece 0 \u5f00\u59cb\u4e14\u8fde\u7eed&#xff01;<\/p>\n<h3>5.9 \u4e0e #define \u5bf9\u6bd4<\/h3>\n<table>\n<tr>\u7279\u6027enum#define<\/tr>\n<tbody>\n<tr>\n<td>\u7c7b\u578b\u68c0\u67e5<\/td>\n<td>\u6709\u4e00\u5b9a&#xff08;\u4ecd\u662f int&#xff09;<\/td>\n<td>\u65e0&#xff08;\u7eaf\u6587\u672c\u66ff\u6362&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u8c03\u8bd5\u652f\u6301<\/td>\n<td>\u8c03\u8bd5\u5668\u53ef\u663e\u793a\u540d\u5b57<\/td>\n<td>\u53ea\u80fd\u770b\u5230\u6570\u5b57<\/td>\n<\/tr>\n<tr>\n<td>\u4f5c\u7528\u57df<\/td>\n<td>\u9075\u5faa C \u4f5c\u7528\u57df\u89c4\u5219<\/td>\n<td>\u5168\u5c40\u5b8f&#xff0c;\u6613\u51b2\u7a81<\/td>\n<\/tr>\n<tr>\n<td>\u81ea\u52a8\u751f\u6210\u503c<\/td>\n<td>\u652f\u6301&#xff08;\u9ed8\u8ba4 0,1,2\u2026&#xff09;<\/td>\n<td>\u9700\u624b\u52a8\u5199<\/td>\n<\/tr>\n<tr>\n<td>\u5185\u5b58<\/td>\n<td>\u4e0d\u5360\u7528&#xff08;\u7f16\u8bd1\u671f\u5e38\u91cf&#xff09;<\/td>\n<td>\u4e0d\u5360\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4f18\u5148\u4f7f\u7528 enum \u800c\u4e0d\u662f #define \u6765\u5b9a\u4e49\u76f8\u5173\u5e38\u91cf\u7ec4&#xff01;<\/p>\n<h3>5.10 \u603b\u7ed3<\/h3>\n<ul>\n<li>enum \u662f\u5b9a\u4e49\u547d\u540d\u6574\u578b\u5e38\u91cf\u96c6\u5408\u7684\u5de5\u5177\u3002<\/li>\n<li>\u9ed8\u8ba4\u503c\u4ece 0 \u5f00\u59cb&#xff0c;\u53ef\u663e\u5f0f\u8d4b\u503c\u3002<\/li>\n<li>\u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027&#xff0c;\u66ff\u4ee3\u201c\u9b54\u6cd5\u6570\u5b57\u201d\u3002<\/li>\n<li>\u672c\u8d28\u662f int&#xff0c;\u4e0d\u662f\u5f3a\u7c7b\u578b&#xff08;C \u8bed\u8a00\u9650\u5236&#xff09;\u3002<\/li>\n<li>\u914d\u5408 typedef \u4f7f\u7528\u66f4\u7b80\u6d01\u3002<\/li>\n<li>\u9002\u5408\u8868\u793a\u72b6\u6001\u3001\u9009\u9879\u3001\u7c7b\u522b\u7b49\u79bb\u6563\u503c\u3002<\/li>\n<\/ul>\n<p>\u6700\u4f73\u5b9e\u8df5&#xff1a;<\/p>\n<p><span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">enum<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    STATUS_OK <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    STATUS_ERROR<span class=\"token punctuation\">,<\/span><br \/>\n    STATUS_TIMEOUT<br \/>\n<span class=\"token punctuation\">}<\/span>Status<span class=\"token punctuation\">;<\/span><\/p>\n<h2>\u516d\u3001\u5185\u5b58\u7ba1\u7406<\/h2>\n<h3>6.1 \u5b58\u50a8\u6a21\u578b<\/h3>\n<p>C\u548cC&#043;&#043;\u5b9a\u4e49\u4e86\u56db\u4e2a\u5185\u5b58\u533a\u95f4&#xff1a;\u4ee3\u7801\u533a\u3001\u5168\u5c40\u53d8\u91cf\u548c\u9759\u6001\u53d8\u91cf\u533a\u3001\u5c40\u90e8\u53d8\u91cf\u533a\u5373\u6808\u533a\u3001\u52a8\u6001\u5b58\u50a8\u533a \u5373\u5806\u533a<\/p>\n<ul>\n<li>\n<p>\u9759\u6001\u5b58\u50a8\u5206\u914d<\/p>\n<ul>\n<li>\u901a\u5e38\u5b9a\u4e49\u53d8\u91cf&#xff0c;\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u90fd\u53ef\u4ee5\u6839\u636e\u8be5\u53d8\u91cf\u7684\u7c7b\u578b\u77e5\u9053\u6240\u9700\u5185\u5b58\u7a7a\u95f4\u7684\u5927\u5c0f&#xff0c;\u4ece\u800c\u7cfb\u7edf\u5728\u9002\u5f53\u7684\u65f6\u5019\u4e3a\u4ed6\u4eec\u5206\u914d\u786e\u5b9a\u7684\u5b58\u50a8\u7a7a\u95f4\u3002<\/li>\n<li>\u5728\u6267\u884c\u51fd\u6570\u65f6&#xff0c;\u51fd\u6570\u5185\u5c40\u90e8\u53d8\u91cf\u7684\u5b58\u50a8\u5355\u5143\u90fd\u53ef\u4ee5\u5728\u6808\u4e0a\u521b\u5efa&#xff0c;\u51fd\u6570\u6267\u884c\u7ed3\u675f\u65f6\u8fd9\u4e9b\u5b58\u50a8\u5355\u5143\u81ea\u52a8\u88ab\u91ca\u653e\u3002<\/li>\n<li>\u6808\u5185\u5b58\u5206\u914d\u8fd0\u7b97\u5185\u7f6e\u4e8e\u5904\u7406\u5668\u7684\u6307\u4ee4\u96c6\u4e2d&#xff0c;\u6548\u7387\u5f88\u9ad8&#xff0c;\u4f46\u662f\u5206\u914d\u7684\u5185\u5b58\u5bb9\u91cf\u6709\u9650\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u52a8\u6001\u5185\u5b58\u5206\u914d<\/p>\n<ul>\n<li>\u6709\u4e9b\u64cd\u4f5c\u5bf9\u8c61\u53ea\u6709\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u624d\u80fd\u786e\u5b9a&#xff0c;\u8fd9\u6837\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u65e0\u6cd5\u4e3a\u4ed6\u4eec\u9884\u5b9a\u5b58\u50a8\u7a7a\u95f4&#xff0c;\u53ea\u80fd\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6&#xff0c;\u7cfb\u7edf\u6839\u636e\u8fd0\u884c\u65f6\u7684\u8981\u6c42\u8fdb\u884c\u5185\u5b58\u5206\u914d\u3002<\/li>\n<li>\u6240\u6709\u52a8\u6001\u5b58\u50a8\u5206\u914d\u90fd\u5728\u5806\u533a\u4e2d\u8fdb\u884c\u3002<\/li>\n<li>\u4ece\u5806\u4e0a\u5206\u914d&#xff0c;\u4e5f\u53eb\u505a\u52a8\u6001\u5185\u5b58\u5206\u914d\u3002\u7a0b\u5e8f\u5728\u8fd0\u884c\u7684\u65f6\u5019\u7528 malloc \u7533\u8bf7\u4efb\u610f\u591a\u5c11\u7684\u5185\u5b58&#xff0c;\u7a0b\u5e8f\u5458\u81ea\u5df1\u8d1f\u8d23\u5728\u4f55\u65f6\u7528 free \u91ca\u653e\u5185\u5b58\u3002\u52a8\u6001\u5185\u5b58\u7684\u751f\u5b58\u671f\u7531\u6211\u4eec\u51b3\u5b9a&#xff0c;\u4f7f\u7528\u975e\u5e38\u7075\u6d3b&#xff0c;\u4f46\u95ee\u9898\u4e5f\u6700\u591a\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5806\u5185\u5b58\u7684\u5206\u914d \u548c \u91ca\u653e<\/p>\n<ul>\n<li>\u5f53\u7a0b\u5e8f\u8fd0\u884c\u5230\u9700\u8981\u4e00\u4e2a\u52a8\u6001\u5206\u914d\u7684 \u53d8\u91cf \u6216 \u5bf9\u8c61\u65f6&#xff0c;\u5fc5\u987b\u5411\u7cfb\u7edf\u7533\u8bf7\u53d6\u5f97\u5806\u4e2d\u7684\u4e00\u5757\u6240\u9700\u5927\u5c0f\u7684\u5b58\u50a8\u7a7a\u95f4&#xff0c;\u7528\u4e8e\u5b58\u50a8\u8be5\u53d8\u91cf\u6216\u5bf9\u8c61\u3002\u5f53\u4e0d\u518d\u4f7f\u7528\u8be5\u53d8\u91cf\u6216\u5bf9\u8c61\u65f6&#xff0c;\u4e5f\u5c31\u662f\u5b83\u7684\u751f\u547d\u7ed3\u675f\u65f6&#xff0c;\u8981\u663e\u5f0f\u91ca\u653e\u4ed6\u6240\u5360\u7528\u7684\u5b58\u50a8\u7a7a\u95f4&#xff0c;\u8fd9\u6837\u7cfb\u7edf\u5c31\u80fd\u5bf9\u8be5\u5806\u7a7a\u95f4\u8fdb\u884c\u518d\u6b21\u5206\u914d&#xff0c;\u505a\u5230\u91cd\u590d\u4f7f\u7528\u6709\u9650\u7684\u8d44\u6e90\u3002<\/li>\n<li>\u5806\u533a\u662f\u4e0d\u4f1a\u81ea\u52a8\u5728\u5206\u914d\u65f6\u505a\u521d\u59cb\u5316\u7684&#xff0c;\u6240\u4ee5\u5fc5\u987b\u7528\u521d\u59cb\u5316\u6765\u663e\u5f0f\u521d\u59cb\u5316\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>6.2 \u52a8\u6001\u5185\u5b58<\/h3>\n<p>malloc \/ free<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">size_t<\/span> num<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>p<span class=\"token punctuation\">)<\/span><\/p>\n<ul>\n<li>malloc \u51fd\u6570\u672c\u8eab\u5e76\u4e0d\u8bc6\u522b\u8981\u7533\u8bf7\u7684\u5185\u5b58\u662f\u4ec0\u4e48\u7c7b\u578b&#xff0c;\u5b83\u53ea\u5173\u5fc3\u5185\u5b58\u7684\u603b\u5b57\u8282\u6570\u3002<\/li>\n<li>malloc \u7533\u8bf7\u5230\u7684\u662f\u4e00\u5757\u8fde\u7eed\u7684\u5185\u5b58&#xff0c;\u6709\u65f6\u53ef\u80fd\u4f1a\u6bd4\u6240\u7533\u8bf7\u7684\u7a7a\u95f4\u5927&#xff0c;\u5176\u6709\u65f6\u4f1a\u7533\u8bf7\u4e0d\u5230\u5185\u5b58&#xff0c;\u8fd4\u56de NULL\u3002<\/li>\n<li>malloc \u8fd4\u56de\u503c\u7684\u7c7b\u578b\u662f void ,\u6240\u4ee5\u5728\u8c03\u7528\u7684\u65f6\u5019\u9700\u8981\u663e\u5f0f\u7684\u8fdb\u884c\u7c7b\u578b\u8f6c\u5316&#xff0c;\u5c06void \u8f6c\u5316\u6210\u6240\u9700\u7684\u6307\u9488\u7c7b\u578b\u3002<\/li>\n<li>\u5982\u679c free \u7684\u53c2\u6570\u662f null \u7684\u8bdd&#xff0c;\u6ca1\u6709\u4efb\u4f55\u6548\u679c \u91ca\u653e\u4e00\u5757\u5185\u5b58\u4e2d\u7684\u4e00\u90e8\u5206\u662f\u4e0d\u88ab\u5141\u8bb8\u7684\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f\u4e8b\u9879 1\u3001\u5220\u9664\u4e00\u4e2a\u6307\u9488 p free(p); \u5b9e\u9645\u610f\u601d\u662f\u5220\u9664\u4e86p\u6240\u6307\u7684\u76ee\u6807(\u53d8\u91cf\u6216\u5bf9\u8c61\u7b49)&#xff0c;\u91ca\u653e\u4e86\u5b83\u6240\u6307\u5360\u7684\u5806\u7a7a\u95f4&#xff0c;\u800c\u4e0d\u662f\u5220\u9664p\u672c\u8eab&#xff0c;\u91ca\u653e\u5806\u7a7a\u95f4\u540e&#xff0c;p \u6210\u4e86\u7a7a\u60ac\u6307\u9488\u3002<\/p>\n<p>2\u3001\u52a8\u6001\u8d44\u6e90\u5206\u914d\u5931\u8d25&#xff0c;\u8fd4\u56de\u4e00\u4e2a\u7a7a\u6307\u9488(null), \u8868\u793a\u53d1\u751f\u4e86\u5f02\u5e38&#xff0c;\u5806\u8d44\u6e90\u4e0d\u8db3&#xff0c;\u5206\u914d\u5931\u8d25\u3002<\/p>\n<p>3\u3001 malloc \u548c free\u662f\u914d\u5bf9\u4f7f\u7528\u7684&#xff0c;free\u53ea\u80fd\u91ca\u653e\u5806\u7a7a\u95f4\u3002\u5982\u679cmalloc\u8fd4\u56de\u7684\u6307\u9488\u503c\u4e22\u5931&#xff0c;\u5219\u6240\u5206\u914d\u7684\u5806\u7a7a\u95f4\u65e0\u6cd5\u56de\u6536&#xff0c;\u79f0\u4e3a\u5185\u5b58\u6cc4\u6f0f<\/p>\n<p>\u540c\u4e00\u7a7a\u95f4\u91cd\u590d\u91ca\u653e\u4e5f\u662f\u5371\u9669\u7684&#xff0c;\u56e0\u4e3a\u8be5\u7a7a\u95f4\u53ef\u80fd\u5df2\u53e6\u5206\u914d&#xff0c;\u6240\u4ee5\u5fc5\u987b\u59a5\u5584\u4fdd\u5b58malloc\u8fd4\u56de\u7684\u6307\u9488&#xff0c;\u4ee5\u4fdd\u8bc1\u4e0d\u53d1\u751f\u5185\u5b58\u6cc4\u6f0f&#xff0c;\u4e5f\u5fc5\u987b\u4fdd\u8bc1\u4e0d\u597d\u91cd\u590d\u91ca\u653e\u5806\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n<ul>\n<li>\u91ce\u6307\u9488&#xff1a;\u4e0d\u662fNULL\u6307\u9488&#xff0c;\u662f\u6307\u5411&#034;\u5783\u573e&#034;\u5185\u5b58\u7684\u6307\u9488&#xff0c;\u91ce\u6307\u9488 \u5f88\u5371\u9669\u3002<\/li>\n<li>\u91ce\u6307\u9488\u9020\u6210\u7684\u4e3b\u8981\u539f\u56e0\u6709\u4e24\u79cd\n<ul>\n<li>\u6307\u9488\u53d8\u91cf\u6ca1\u6709\u521d\u59cb\u5316<\/li>\n<li>\u6307\u9488\u53d8\u91cf p \u88ab free \u4e4b\u540e&#xff0c;\u6ca1\u6709\u7f6e\u4e3a NULL&#xff0c;\u8ba9\u4eba\u8bef\u4ee5\u4e3ap\u662f\u4e2a\u5408\u6cd5\u7684\u6307\u9488&#xff0c;\u6307\u9488\u64cd\u4f5c\u8d85\u8d8a\u4e86\u53d8\u91cf\u7684\u4f7f\u7528\u8303\u56f4\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u76ee\u5f55\u4e00\u3001typedef1.1 \u58f0\u660e\u6574\u578b1.2 \u58f0\u660e\u7ed3\u6784\u4f53\u7c7b\u578b1.3 \u58f0\u660e\u6570\u7ec41.4 \u58f0\u660e\u6307\u94881.5 \u58f0\u660e\u6570\u7ec4\u6307\u94881.6 \u58f0\u660e\u51fd\u6570\u6307\u94881.7 \u58f0\u660e\u679a\u4e3e\u7c7b\u578b\u4e8c\u3001\u5171\u7528\u4f532.1 \u5171\u7528\u4f53\u7684\u5b9a\u4e492.2 \u5171\u7528\u4f53 vs \u7ed3\u6784\u4f532.3 \u4f7f\u7528\u793a\u4f8b2.4 \u5178\u578b\u5e94\u7528\u573a\u666f2.5 \u4e0e\u7ed3\u6784\u4f53\u5d4c\u5957\u4f7f\u75282.6 \u603b\u7ed3\u4e09\u3001\u4f4d\u8fd0\u7b973.1 \u6309\u4f4d\u4e0e &amp;3.2 \u6309\u4f4d\u6216 |3.3 \u5f02\u6216 ^3.4 \u53d6\u53cd\u8fd0\u7b97\u7b26 ~3.5 \u5de6\u79fb\u8fd0\u7b97\u7b26 &lt;&gt;3.7 \u8d4b\u503c\u8fd0\u7b97\u7b26\u56db\u3001 \u4f4d\u6bb5\u4e94\u3001\u679a\u4e3e\u7c7b\u578b5.1 \u57fa\u672c\u8bed\u6cd55.2 \u679a<\/p>\n","protected":false},"author":2,"featured_media":65479,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[174,427],"topic":[],"class_list":["post-65480","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-c","tag-427"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>c\u8bed\u8a00 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