{"id":3446,"date":"2025-04-06T00:03:32","date_gmt":"2025-04-05T16:03:32","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3446"},"modified":"2025-04-06T00:03:32","modified_gmt":"2025-04-05T16:03:32","slug":"c-%e8%af%ad%e8%a8%80%e5%8f%af%e5%8f%98%e5%8f%82%e6%95%b0%ef%bc%88variadic-arguments%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/04\/06\/c-%e8%af%ad%e8%a8%80%e5%8f%af%e5%8f%98%e5%8f%82%e6%95%b0%ef%bc%88variadic-arguments%ef%bc%89\/","title":{"rendered":"C \u8bed\u8a00\u53ef\u53d8\u53c2\u6570\uff08Variadic Arguments\uff09"},"content":{"rendered":"\n<p>\u5728 C \u8bed\u8a00\u4e2d\uff0c<strong>\u53ef\u53d8\u53c2\u6570\uff08Variadic Arguments\uff09<\/strong>\u5141\u8bb8\u4e00\u4e2a\u51fd\u6570\u63a5\u53d7\u4e0d\u5b9a\u6570\u91cf\u7684\u53c2\u6570\uff0c\u5e38\u89c1\u7684\u4f8b\u5b50\u662f\u6807\u51c6\u5e93\u51fd\u6570 <code>printf()<\/code>\u3002\u8fd9\u90e8\u5206\u5185\u5bb9\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u4f46\u9700\u8981\u638c\u63e1\u5176\u5e95\u5c42\u673a\u5236\u4e0e\u5b89\u5168\u4f7f\u7528\u65b9\u5f0f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udcd8 \u4e00\u3001\u4ec0\u4e48\u662f\u53ef\u53d8\u53c2\u6570\uff1f<\/h2>\n\n\n\n<p><strong>\u53ef\u53d8\u53c2\u6570\u51fd\u6570<\/strong>\u5c31\u662f\u5f62\u53c2\u4e2d<strong>\u53c2\u6570\u4e2a\u6570\u4e0d\u56fa\u5b9a<\/strong>\u7684\u51fd\u6570\u3002<\/p>\n\n\n\n<p>\u7ecf\u5178\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int printf(const char *format, ...);<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528 <code>...<\/code> \u8868\u793a\u53ef\u53d8\u53c2\u6570\uff0c\u5176\u5b9e\u8d28\u662f\u4f9d\u8d56 <code>&lt;stdarg.h&gt;<\/code> \u63d0\u4f9b\u7684\u5b8f\u64cd\u4f5c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udcda \u4e8c\u3001\u5f15\u5165\u5934\u6587\u4ef6 <code>&lt;stdarg.h&gt;<\/code><\/h2>\n\n\n\n<p>\u8981\u4f7f\u7528\u53ef\u53d8\u53c2\u6570\uff0c\u5fc5\u987b\u5f15\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdarg.h&gt;<\/code><\/pre>\n\n\n\n<p>\u5b83\u63d0\u4f9b\u4ee5\u4e0b\u5b8f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>va_list<\/code>\uff1a\u7c7b\u578b\uff0c\u7528\u4e8e\u8bbf\u95ee\u53ef\u53d8\u53c2\u6570\u5217\u8868<\/li>\n\n\n\n<li><code>va_start(va_list ap, last_fixed_param)<\/code>\uff1a\u521d\u59cb\u5316 <code>ap<\/code> \u6307\u9488\uff0clast_fixed_param \u662f\u6700\u540e\u4e00\u4e2a<strong>\u5df2\u77e5\u53c2\u6570<\/strong><\/li>\n\n\n\n<li><code>va_arg(va_list ap, type)<\/code>\uff1a\u8bbf\u95ee\u5f53\u524d\u53c2\u6570\u5e76\u5c06\u6307\u9488\u79fb\u81f3\u4e0b\u4e00\u4e2a\u53c2\u6570<\/li>\n\n\n\n<li><code>va_end(va_list ap)<\/code>\uff1a\u6e05\u7406\u5de5\u4f5c<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udee0\ufe0f \u4e09\u3001\u5b8c\u6574\u793a\u4f8b\uff1a\u6c42\u4e00\u7ec4\u6570\u7684\u548c<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n#include &lt;stdarg.h&gt;\n\nint sum(int count, ...) {\n    va_list args;\n    va_start(args, count);\n\n    int total = 0;\n    for (int i = 0; i &lt; count; i++) {\n        total += va_arg(args, int);  \/\/ \u83b7\u53d6\u5f53\u524d\u53c2\u6570\u5e76\u524d\u8fdb\n    }\n\n    va_end(args);\n    return total;\n}\n\nint main() {\n    printf(\"Sum: %d\\n\", sum(4, 10, 20, 30, 40));  \/\/ \u8f93\u51fa\uff1aSum: 100\n    return 0;\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd2c \u56db\u3001\u5b9e\u73b0\u673a\u5236\uff08\u5e95\u5c42\u539f\u7406\uff09<\/h2>\n\n\n\n<p>\u5728\u51fd\u6570\u8c03\u7528\u65f6\uff0c\u53ef\u53d8\u53c2\u6570\u4f1a\u88ab\u538b\u5165\u51fd\u6570\u6808\uff08\u6216\u5bc4\u5b58\u5668\u4e2d\uff0c\u53d6\u51b3\u4e8e ABI\uff09\uff0c\u901a\u8fc7 <code>va_start<\/code> \u8bbe\u7f6e\u6307\u9488\uff0c<code>va_arg<\/code> \u4f9d\u6b21\u53d6\u51fa\u53c2\u6570\u3002C \u7f16\u8bd1\u5668\u65e0\u6cd5\u77e5\u9053\u53c2\u6570\u4e2a\u6570\u548c\u7c7b\u578b\uff0c\u56e0\u6b64\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u26a0\ufe0f <strong>\u4f60\u5fc5\u987b\u81ea\u5df1\u7ba1\u7406\u53c2\u6570\u6570\u91cf\u548c\u7c7b\u578b<\/strong>\uff0c\u5426\u5219\u4f1a\u51fa\u73b0\u672a\u5b9a\u4e49\u884c\u4e3a\uff01<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u26a0\ufe0f \u4e94\u3001\u6ce8\u610f\u4e8b\u9879<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u274c <strong>\u65e0\u6cd5\u81ea\u52a8\u77e5\u9053\u53c2\u6570\u6570\u91cf\u6216\u7c7b\u578b<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9700\u8981\u901a\u8fc7<strong>\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f20\u5165\u6570\u91cf<\/strong>\u6216<strong>\u683c\u5f0f\u5b57\u7b26\u4e32\uff08\u5982 printf\uff09<\/strong>\u6765\u7ea6\u5b9a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u274c <strong>\u4e0d\u652f\u6301\u7ed3\u6784\u4f53\u7c7b\u578b\u53c2\u6570\u4f20\u9012\uff08\u67d0\u4e9b\u7f16\u8bd1\u5668\uff09<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7ed3\u6784\u4f53\u6309\u503c\u4f20\u53c2\u672a\u5b9a\u4e49\u884c\u4e3a\uff0c\u9700\u7528\u6307\u9488\u4f20\u9012<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u2705 \u5fc5\u987b\u8c03\u7528 <code>va_end()<\/code> \u91ca\u653e\u8d44\u6e90<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u2705 \u516d\u3001\u589e\u5f3a\u5b89\u5168\u6027\uff08\u7c7b\u578b\u68c0\u67e5\uff09<\/h2>\n\n\n\n<p>C11 \u5f15\u5165 <code>__attribute__ ((format (printf, x, y)))<\/code> \u7528\u4e8e\u81ea\u5b9a\u4e49\u51fd\u6570\u7684\u683c\u5f0f\u5b57\u7b26\u4e32\u68c0\u67e5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>__attribute__((format(printf, 1, 2)))\nvoid my_printf(const char *fmt, ...);<\/code><\/pre>\n\n\n\n<p>\u8868\u793a\u53c2\u6570\u4ece\u7b2c1\u4e2a\u662f\u683c\u5f0f\u4e32\uff0c\u7b2c2\u4e2a\u5f00\u59cb\u662f\u53c2\u6570\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udd17 \u4e03\u3001\u6743\u5a01\u8d44\u6599\u4e0e\u51fa\u7ad9\u94fe\u63a5<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u540d\u79f0<\/th><th>\u94fe\u63a5<\/th><\/tr><\/thead><tbody><tr><td>C99 \u6807\u51c6 <code>&lt;stdarg.h&gt;<\/code> \u6587\u6863<\/td><td><a href=\"https:\/\/en.cppreference.com\/w\/c\/variadic\">https:\/\/en.cppreference.com\/w\/c\/variadic<\/a><\/td><\/tr><tr><td>GNU C Manual &#8211; Variadic Functions<\/td><td><a href=\"https:\/\/gcc.gnu.org\/onlinedocs\/gcc\/Variable-Arguments.html\">https:\/\/gcc.gnu.org\/onlinedocs\/gcc\/Variable-Arguments.html<\/a><\/td><\/tr><tr><td>Linux man \u624b\u518c\uff1ava_start<\/td><td><a href=\"https:\/\/man7.org\/linux\/man-pages\/man3\/stdarg.3.html\">https:\/\/man7.org\/linux\/man-pages\/man3\/stdarg.3.html<\/a><\/td><\/tr><tr><td>GeeksForGeeks \u8bb2\u89e3<\/td><td><a href=\"https:\/\/www.geeksforgeeks.org\/variadic-functions-in-c\/\">https:\/\/www.geeksforgeeks.org\/variadic-functions-in-c\/<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\udde0 \u516b\u3001\u603b\u7ed3\uff1a\u4f7f\u7528\u53ef\u53d8\u53c2\u6570\u7684\u6b65\u9aa4<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6b65\u9aa4<\/th><th>\u64cd\u4f5c<\/th><\/tr><\/thead><tbody><tr><td>1\ufe0f\u20e3 \u5f15\u5165\u5934\u6587\u4ef6<\/td><td><code>#include &lt;stdarg.h&gt;<\/code><\/td><\/tr><tr><td>2\ufe0f\u20e3 \u5b9a\u4e49\u51fd\u6570<\/td><td>\u4f7f\u7528 <code>...<\/code> \u8868\u793a\u53ef\u53d8\u53c2\u6570<\/td><\/tr><tr><td>3\ufe0f\u20e3 \u521d\u59cb\u5316\u53c2\u6570\u5217\u8868<\/td><td><code>va_start(ap, last_named_param)<\/code><\/td><\/tr><tr><td>4\ufe0f\u20e3 \u83b7\u53d6\u53c2\u6570\u503c<\/td><td><code>va_arg(ap, type)<\/code><\/td><\/tr><tr><td>5\ufe0f\u20e3 \u6e05\u7406\u5de5\u4f5c<\/td><td><code>va_end(ap)<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 C \u8bed\u8a00\u4e2d\uff0c\u53ef\u53d8\u53c2\u6570\uff08Variadic Arguments\uff09\u5141\u8bb8\u4e00\u4e2a\u51fd\u6570\u63a5\u53d7\u4e0d\u5b9a\u6570\u91cf\u7684\u53c2\u6570\uff0c\u5e38\u89c1\u7684\u4f8b\u5b50\u662f\u6807 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3447,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[82],"tags":[],"class_list":["post-3446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3446"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3446\/revisions"}],"predecessor-version":[{"id":3448,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3446\/revisions\/3448"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3447"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}