{"id":7838,"date":"2024-07-04T10:01:01","date_gmt":"2024-07-04T02:01:01","guid":{"rendered":""},"modified":"2024-07-04T10:01:01","modified_gmt":"2024-07-04T02:01:01","slug":"C\u8bed\u8a00\u7ecf\u5178\u6848\u4f8b void (*signal(int sig, void (*func)(int)))(int) \u89e3\u8bfb,\u5e26\u4f60\u5b66\u4e60\u51fd\u6570\u540d\u7684\u672c\u8d28,\u51fd\u6570\u6307\u9488\u4e0e\u6307\u9488\u51fd\u6570,\u4ee5\u53ca\u56de\u8c03","status":"publish","type":"post","link":"https:\/\/mushiming.com\/7838.html","title":{"rendered":"C\u8bed\u8a00\u7ecf\u5178\u6848\u4f8b void (*signal(int sig, void (*func)(int)))(int) \u89e3\u8bfb,\u5e26\u4f60\u5b66\u4e60\u51fd\u6570\u540d\u7684\u672c\u8d28,\u51fd\u6570\u6307\u9488\u4e0e\u6307\u9488\u51fd\u6570,\u4ee5\u53ca\u56de\u8c03"},"content":{"rendered":"<p><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"display: none;\"> \n <path stroke-linecap=\"round\" d=\"M5,0 0,2.5 5,5z\" id=\"raphael-marker-block\" style=\"-webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"><\/path> \n<\/svg> <\/p>\n<div class=\"toc\">\n<h4>\u76ee\u5f55<\/h4>\n<ul>\n<li>\u6848\u4f8b\u89e3\u8bfb<\/li>\n<li>\n<ul>\n<li>1 \u51fd\u6570\u6307\u9488\u4e0e\u6307\u9488\u51fd\u6570<\/li>\n<li>\n<ul>\n<li>1.1 \u6307\u9488\u51fd\u6570<\/li>\n<li>1.2 \u51fd\u6570\u6307\u9488<\/li>\n<\/ul>\n<\/li>\n<li>2 \u89e3\u6790void (*signal (int sinno,void(*func)(int)))(int)<\/li>\n<li>3 \u51fd\u6570\u6307\u9488\u4e0e\u56de\u8c03<\/li>\n<li>\n<ul>\n<li>3.1 ((void (*)(void))0x00)() \u901a\u8fc7\u5730\u5740\u8c03\u7528\u51fd\u6570<\/li>\n<li>3.2 \u4f8b\u7a0b2<\/li>\n<li>3.3 \u7528\u6765\u89e3\u91ca\u4f8b3.1\u548c\u4f8b3.2\u7684C\u8bed\u8a00\u4ee3\u7801<\/li>\n<li>3.4 \u591a\u79cd\u73a9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n<h2>\u6848\u4f8b\u89e3\u8bfb<\/h2>\n<p>\u51fd\u6570: <code>void (*signal (int sinno,void(*func)(int)))(int)<\/code><\/p>\n<p>\u4e0a\u8ff0\u51fd\u6570\u8be5\u5982\u4f55\u8bfb\u5462? \u90a3\u4e48\u5148\u4e86\u89e3\u4e0b\u9762\u7684\u4e00\u7ec4\u6982\u5ff5<\/p>\n<h3>1 \u51fd\u6570\u6307\u9488\u4e0e\u6307\u9488\u51fd\u6570<\/h3>\n<p><code>\u6307\u9488\u51fd\u6570:<\/code> \u672c\u8d28\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u5176\u8fd4\u56de\u503c\u4e3a\u6307\u9488\u3002<\/p>\n<p><code>\u51fd\u6570\u6307\u9488:<\/code> \u672c\u8d28\u662f\u4e00\u4e2a\u6307\u9488\uff0c\u5176\u6307\u5411\u4e00\u4e2a\u51fd\u6570\u3002<\/p>\n<p>\u5982\u679c\u60f3\u8be6\u7ec6\u66f4\u8fdb\u4e00\u6b65\u7684\u4e86\u89e3,\u53ef\u4ee5\u53c2\u8003\u4e0b\u8ff0\u6587\u7ae0: \u51fd\u6570\u6307\u9488\u548c\u6307\u9488\u51fd\u6570\u7528\u6cd5\u548c\u533a\u522b<\/p>\n<h4>1.1 \u6307\u9488\u51fd\u6570<\/h4>\n<p><code>\u6307\u9488\u51fd\u6570:<\/code> \u7b80\u5355\u7684\u6765\u8bf4\uff0c\u5c31\u662f\u4e00\u4e2a\u8fd4\u56de\u6307\u9488\u7684\u51fd\u6570\uff0c\u5176\u672c\u8d28\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u800c\u8be5\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6307\u9488<\/p>\n<p>\u4ee5\u4e0b\u793a\u4f8b:<\/p>\n<ul>\n<li><code>int fun(int x,int y);<\/code> \u8fd9\u79cd\u51fd\u6570\u5e94\u8be5\u90fd\u5f88\u719f\u6089\uff0c\u5176\u5b9e\u5c31\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u7136\u540e\u8fd4\u56de\u503c\u662f\u4e00\u4e2a int \u7c7b\u578b\uff0c\u662f\u4e00\u4e2a\u6570\u503c<\/li>\n<li><code>int *fun(int x,int y);<\/code> \u8fd9\u4e2a\u51fd\u6570\u5c31\u662f\u4e00\u4e2a\u6307\u9488\u51fd\u6570\u3002\u5176\u8fd4\u56de\u503c\u662f\u4e00\u4e2a int \u7c7b\u578b\u7684\u6307\u9488\uff0c\u662f\u4e00\u4e2a\u5730\u5740\u3002<\/li>\n<\/ul>\n<p>\u603b\u7ed3: \u6307\u9488\u51fd\u6570\u548c\u666e\u901a\u51fd\u6570\u5bf9\u6bd4\u4e0d\u8fc7\u5c31\u662f\u5176\u8fd4\u56de\u4e86\u4e00\u4e2a\u6307\u9488\uff08\u5373\u5730\u5740\u503c\uff09\u800c\u5df2<\/p>\n<h4>1.2 \u51fd\u6570\u6307\u9488<\/h4>\n<p><code>\u51fd\u6570\u6307\u9488:<\/code> \u5176\u672c\u8d28\u662f\u4e00\u4e2a\u6307\u9488\u53d8\u91cf\uff0c\u8be5\u6307\u9488\u6307\u5411\u8fd9\u4e2a\u51fd\u6570\u3002\u603b\u7ed3\u6765\u8bf4\uff0c\u51fd\u6570\u6307\u9488\u5c31\u662f\u6307\u5411\u51fd\u6570\u7684\u6307\u9488\u3002<\/p>\n<p>\u4ee5\u4e0b\u793a\u4f8b:<\/p>\n<ul>\n<li><code>int fun(int x,int y);<\/code> \u666e\u901a\u51fd\u6570<\/li>\n<li><code>int *fun(int x,int y);<\/code> \u6307\u9488\u51fd\u6570<\/li>\n<li><code>int (*fun)(int x,int y);<\/code> \u51fd\u6570\u6307\u9488<\/li>\n<\/ul>\n<p>\u51fd\u6570\u6307\u9488\u662f\u9700\u8981\u628a\u4e00\u4e2a\u51fd\u6570\u7684\u5730\u5740\u8d4b\u503c\u7ed9\u5b83\uff0c\u6709\u4e24\u79cd\u5199\u6cd5\uff1a<\/p>\n<ol>\n<li><code>fun = &amp;Function;<\/code><\/li>\n<li><code>fun = Function;<\/code><\/li>\n<\/ol>\n<p>\u53d6\u5730\u5740\u8fd0\u7b97\u7b26&amp;\u4e0d\u662f\u5fc5\u9700\u7684\uff0c\u56e0\u4e3a\u4e00\u4e2a\u51fd\u6570\u6807\u8bc6\u7b26\u5c31\u8868\u793a\u4e86\u5b83\u7684\u5730\u5740\uff0c\u5982\u679c\u662f\u51fd\u6570\u8c03\u7528\uff0c\u8fd8\u5fc5\u987b\u5305\u542b\u4e00\u4e2a\u5706\u62ec\u53f7\u62ec\u8d77\u6765\u7684\u53c2\u6570\u8868\u3002<br \/> \u8c03\u7528\u51fd\u6570\u6307\u9488\u7684\u65b9\u5f0f\u4e5f\u6709\u4e24\u79cd\uff1a<\/p>\n<ol>\n<li><code>x = (*fun)();<\/code><\/li>\n<li><code>x = fun();<\/code><\/li>\n<\/ol>\n<p>\u4e24\u79cd\u65b9\u5f0f\u5747\u53ef\uff0c\u770b\u4e2a\u4eba\u4e60\u60ef\uff0c\u5982\u679c\u7406\u89e3\u5176\u5b9a\u4e49\uff0c\u968f\u4fbf\u600e\u4e48\u7528\u90fd\u884c<\/p>\n<h3>2 \u89e3\u6790void (*signal (int sinno,void(*func)(int)))(int)<\/h3>\n<pre class=\"language-java prettyprint linenums\"><code class=\"prism language-c\"><span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token function\">signal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sig<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>func<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>func<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span> A func \u662f\u4e00\u4e2a\u6307\u5411\u51fd\u6570\u7684\u6307\u9488<span class=\"token operator\">--<\/span>\u8be5\u51fd\u6570\u4ee5<span class=\"token keyword\">int<\/span>\u4f5c\u4e3a\u5165\u53c2\uff0c\u8fd4\u56de\u503c\u4e3a\u7a7a <span class=\"token function\">signal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sig<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>func<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span> B signal \u662f\u4e00\u4e2a\u51fd\u6570<span class=\"token operator\">--<\/span> \u8be5\u51fd\u6570\u6709\u4e24\u4e2a\u53c2\u6570\uff08\u4e00\u4e2a\u662f<span class=\"token keyword\">int<\/span>\u578b\u53d8\u91cf sig \u4e00\u4e2a\u662f\u6307\u5411\u51fd\u6570\u7684\u6307\u9488A\uff09 <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>B<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span> B\u662f\u4e00\u4e2a\u51fd\u6570<span class=\"token punctuation\">,<\/span>\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6307\u5411\u51fd\u6570\uff08\u5165\u53c2\u4e3a<span class=\"token keyword\">int<\/span> \u8fd4\u56de\u503c\u4e3a\u7a7a\uff09\u7684\u6307\u9488 signal \u662f\u4e00\u4e2a\u51fd\u6570<span class=\"token operator\">--<\/span> \u8be5\u51fd\u6570\u6709\u4e24\u4e2a\u53c2\u6570\uff08\u4e00\u4e2a\u662f<span class=\"token keyword\">int<\/span>\u578b\u53d8\u91cf sig \u4e00\u4e2a\u662f\u6307\u5411\u51fd\u6570<span class=\"token punctuation\">(<\/span>\u8be5\u51fd\u6570\u4ee5<span class=\"token keyword\">int<\/span>\u4f5c\u4e3a\u5165\u53c2\uff0c\u8fd4\u56de\u503c\u4e3a\u7a7a <span class=\"token punctuation\">)<\/span>\u7684\u6307\u9488\uff09 <span class=\"token punctuation\">,<\/span>signal\u7684\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6307\u5411\u51fd\u6570\uff08\u5165\u53c2\u4e3a<span class=\"token keyword\">int<\/span> \u8fd4\u56de\u503c\u4e3a\u7a7a\uff09\u7684\u6307\u9488 <\/code><\/pre>\n<h3>3 \u51fd\u6570\u6307\u9488\u4e0e\u56de\u8c03<\/h3>\n<p>\u51fd\u6570\u6307\u9488\uff0c\u4e00\u822c\u7528\u9014\u4f5c\u4e3a\u201c\u56de\u8c03\u51fd\u6570\u201d\u4f7f\u7528\u3002<\/p>\n<p>\u6bd4\u5982\u5199\u4e86\u4e00\u4e2a\u65b9\u6cd5\uff08\u51fd\u6570\uff09\uff0c\u4f60\u5e0c\u671b\u8c03\u7528\u5b83\u6267\u884c\u5b8c\u5904\u7406\u4e4b\u540e\uff0c\u81ea\u52a8\u8c03\u7528\u53e6\u4e00\u4e2a\u540e\u7eed\u7684\u51fd\u6570\u6765\u5904\u7406\u7ee7\u7eed\u7684\u4e1a\u52a1\u3002<br \/> \u8fd9\u4e2a\u65f6\u5019\u5c31\u53ef\u4ee5\u628a \u201c\u4e00\u4e2a\u51fd\u6570\u7684\u5165\u53e3\u5730\u5740\u201d\u5f53\u662f\u4e00\u4e2a\u6307\u9488\u3002 \u4f60\u7684\u5904\u7406\u65b9\u6cd5\u4e2d\u63a5\u53d7\u51fd\u6570\u53c2\u6570\u65f6\u628a\u8fd9\u4e2a\u6307\u9488\u4f20\u8fdb\u6765\u3002<\/p>\n<pre><code class=\"prism language-c\"><span class=\"token comment\">\/\/ \u6307\u9488\u51fd\u6570<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">myPlus<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{ \n   <!-- --><\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"plus:%d + % d = %d\\n\"<\/span> <span class=\"token punctuation\">,<\/span>a <span class=\"token punctuation\">,<\/span>b<span class=\"token punctuation\">,<\/span> a <span class=\"token operator\">+<\/span> b <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">myMinus<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{ \n   <!-- --><\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"minus: %d - % d = %d\\n\"<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> a <span class=\"token operator\">-<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <span class=\"token comment\">\/\/\u53c2\u6570funtz<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">funt2<\/span><span class=\"token punctuation\">(<\/span> <span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b <span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>funtz<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{ \n   <!-- --><\/span> <span class=\"token comment\">\/\/pf\u4e3a\u51fd\u6570\u6307\u9488,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>pf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">,<\/span><span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">)<\/span>funtz<span class=\"token punctuation\">;<\/span> <span class=\"token function\">pf<\/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 keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <span class=\"token comment\">\/\/\u4e3b\u51fd\u6570\u5165\u53e3<\/span> <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\">{ \n   <!-- --><\/span> <span class=\"token function\">funt2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> myPlus<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/myPlus \u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\uff0c\u5b83\u73b0\u5728\u662f\u4f5c\u4e3a\u4e00\u4e2a\u53c2\u6570\u5728\u4f20\u9012<\/span> <span class=\"token function\">funt2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">,<\/span> myMinus<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <\/code><\/pre>\n<ul>\n<li><code>\u51fd\u6570<\/code>: \u672c\u8d28\u662f\u4e00\u6bb5\u53ef\u6267\u884c\u4ee3\u7801\u6bb5\u3002<\/li>\n<li><code>\u51fd\u6570\u540d:<\/code> \u6307\u5411\u8fd9\u6bb5\u4ee3\u7801\u6bb5\u7684\u9996\u5730\u5740\u3002<\/li>\n<\/ul>\n<p>\u51fd\u6570\u5728\u5185\u5b58\u4e2d\u662f\u6709\u5730\u5740\u7684\uff0c\u51fd\u6570\u540d\u5bf9\u5e94\u7740\u51fd\u6570\u7684\u9996\u5730\u5740\uff0c\u65e2\u7136\u6709\u5730\u5740\uff0c\u5c31\u53ef\u4ee5\u5b9a\u4e49\u6307\u9488\u50a8\u5b58\u5730\u5740\u6216\u66f4\u6539\u6307\u9488\u7684\u6307\u5411\uff0c\u5b58\u50a8\u51fd\u6570(\u9996)\u5730\u5740\u7684\u6307\u9488\uff0c\u79f0\u4e3a\u51fd\u6570\u6307\u9488<\/p>\n<h4>3.1 ((void (*)(void))0x00)() \u901a\u8fc7\u5730\u5740\u8c03\u7528\u51fd\u6570<\/h4>\n<pre><code class=\"prism language-c\"><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> <span class=\"token keyword\">void<\/span> <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{ \n   <!-- --><\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"\u8c03\u7528\u4e86print\u51fd\u6570\\n\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <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\">{ \n   <!-- --><\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><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 number\">0x00<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <\/code><\/pre>\n<p>\u7ed3\u679c:<\/p>\n<pre class=\"language-java prettyprint linenums\"><code>\u8c03\u7528\u4e86print\u51fd\u6570 <\/code><\/pre>\n<h4>3.2 \u4f8b\u7a0b2<\/h4>\n<pre><code class=\"prism language-c\"><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> <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\">{ \n   <!-- --><\/span> <span class=\"token keyword\">int<\/span> a<span class=\"token operator\">=<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/a\u7684\u5730\u5740\u662f0x0061fefc<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"\u6253\u5370a:%d\\n\"<\/span><span class=\"token punctuation\">,<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token number\">0x0061fefc<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <\/code><\/pre>\n<p>\u7ed3\u679c:<\/p>\n<pre class=\"language-java prettyprint linenums\"><code>\u6253\u5370a:100 <\/code><\/pre>\n<h4>3.3 \u7528\u6765\u89e3\u91ca\u4f8b3.1\u548c\u4f8b3.2\u7684C\u8bed\u8a00\u4ee3\u7801<\/h4>\n<pre><code class=\"prism language-c\"><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> <span class=\"token keyword\">void<\/span> <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{ \n   <!-- --><\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"\u8c03\u7528\u4e86print\u51fd\u6570\\n\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <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\">{ \n   <!-- --><\/span> <span class=\"token keyword\">int<\/span> a<span class=\"token operator\">=<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"\u7b2c\u4e00\u6b21\u6253\u5370a:%d\\n\"<\/span><span class=\"token punctuation\">,<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"a\u7684\u5730\u5740\u662f:%p\\n\"<\/span><span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/a\u7684\u5730\u5740\u662f0x0061fefc<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"\u7b2c\u4e8c\u6b21\u6253\u5370a:%d\\n\"<\/span><span class=\"token punctuation\">,<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token number\">0x0061fefc<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"\\n\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"print\u7684\u5730\u5740\u662f:%p\\n\"<\/span><span class=\"token punctuation\">,<\/span>print<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/print()\u7684\u5730\u5740\u662f0x00<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><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 number\">0x00<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <\/code><\/pre>\n<p>\u7ed3\u679c:<\/p>\n<pre class=\"language-java prettyprint linenums\"><code>\u7b2c\u4e00\u6b21\u6253\u5370a:100 a\u7684\u5730\u5740\u662f:0061fefc \u7b2c\u4e8c\u6b21\u6253\u5370a:100 \u8c03\u7528\u4e86print\u51fd\u6570 print\u7684\u5730\u5740\u662f:00 \u8c03\u7528\u4e86print\u51fd\u6570 <\/code><\/pre>\n<h4>3.4 \u591a\u79cd\u73a9\u6cd5<\/h4>\n<pre><code class=\"prism language-c\"><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> <span class=\"token keyword\">void<\/span> <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{ \n   <!-- --><\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"\u8c03\u7528\u4e86print\u51fd\u6570\\n\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <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\">{ \n   <!-- --><\/span> <span class=\"token comment\">\/\/void (*p)(void)\u51fd\u6570\u7c7b\u578b\u7684\u57fa\u672c\u683c\u5f0f<\/span> <span class=\"token comment\">\/\/\u7b2c\u4e00\u79cd\u73a9\u6cd5<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><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 number\">0x00<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u7b2c\u4e8c\u79cd\u73a9\u6cd5<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>p1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">=<\/span>print<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\">\/\/\u7b2c\u4e09\u79cd\u73a9\u6cd5(\u4e0d\u63a8\u8350)<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>p2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">=<\/span><span class=\"token operator\">&amp;<\/span>print<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>p2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u7b2c\u56db\u79cd\u73a9\u6cd5<\/span> <span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>PF<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> PF pf<span class=\"token operator\">=<\/span>print<span class=\"token punctuation\">;<\/span> <span class=\"token function\">pf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <\/code><\/pre>\n<p>\u7ed3\u679c:<\/p>\n<pre class=\"language-java prettyprint linenums\"><code>\u8c03\u7528\u4e86print\u51fd\u6570 \u8c03\u7528\u4e86print\u51fd\u6570 \u8c03\u7528\u4e86print\u51fd\u6570 \u8c03\u7528\u4e86print\u51fd\u6570 <\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"C\u8bed\u8a00\u7ecf\u5178\u6848\u4f8b void (*signal(int sig, void (*func)(int)))(int) \u89e3\u8bfb,\u5e26\u4f60\u5b66\u4e60\u51fd\u6570\u540d\u7684\u672c\u8d28,\u51fd\u6570\u6307\u9488\u4e0e\u6307\u9488\u51fd\u6570,\u4ee5\u53ca\u56de\u8c03\u51fd...","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"_links":{"self":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts\/7838"}],"collection":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/comments?post=7838"}],"version-history":[{"count":0,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/posts\/7838\/revisions"}],"wp:attachment":[{"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/media?parent=7838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/categories?post=7838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mushiming.com\/wp-json\/wp\/v2\/tags?post=7838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}