59 lines
2.7 KiB
Markdown
59 lines
2.7 KiB
Markdown
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---
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title: 『C言語ポインタ完全制覇 (標準プログラマーズライブラリ)』
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author: kazu634
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date: 2008-07-06
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url: /2008/07/06/_1035/
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wordtwit_post_info:
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- 'O:8:"stdClass":13:{s:6:"manual";b:0;s:11:"tweet_times";i:1;s:5:"delay";i:0;s:7:"enabled";i:1;s:10:"separation";s:2:"60";s:7:"version";s:3:"3.7";s:14:"tweet_template";b:0;s:6:"status";i:2;s:6:"result";a:0:{}s:13:"tweet_counter";i:2;s:13:"tweet_log_ids";a:1:{i:0;i:4121;}s:9:"hash_tags";a:0:{}s:8:"accounts";a:1:{i:0;s:7:"kazu634";}}'
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categories:
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- C
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- Programming
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---
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<div class="section">
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<h4>
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可変長引数
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</h4>
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<p>
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stdarg.hをインクルードする必要があるらしい。
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</p>
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<pre class="syntax-highlight">
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<span class="synComment">/* ======================= */</span>
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<span class="synComment">/* === Include library === */</span>
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<span class="synComment">/* ======================= */</span>
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<span class="synPreProc">#include </span><span class="synConstant"><stdio.h></span>
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<span class="synPreProc">#include </span><span class="synConstant"><stdarg.h></span>
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<span class="synPreProc">#include </span><span class="synConstant"><assert.h></span>
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<span class="synComment">/* ================= */</span>
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<span class="synComment">/* === Functions === */</span>
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<span class="synComment">/* ================= */</span>
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<span class="synType">void</span> tiny_printf(<span class="synType">char</span> *format, ...)
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{
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<span class="synType">int</span> i;
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<span class="synType">va_list</span> ap;
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va_start(ap, format);
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<span class="synStatement">for</span> (i = <span class="synConstant"></span>; format[i] != <span class="synSpecial">'\0'</span>; i++)
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{
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<span class="synStatement">switch</span> (format[i]){
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<span class="synStatement">case</span> <span class="synConstant">'s'</span>:
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printf(<span class="synConstant">"</span><span class="synSpecial">%s</span><span class="synConstant"> "</span>, va_arg(ap, <span class="synType">char</span>*));
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<span class="synStatement">break</span>;
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<span class="synStatement">case</span> <span class="synConstant">'d'</span>:
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printf(<span class="synConstant">"</span><span class="synSpecial">%d</span><span class="synConstant"> "</span>, va_arg(ap, <span class="synType">int</span>));
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<span class="synStatement">break</span>;
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<span class="synStatement">default</span>:
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assert(<span class="synConstant"></span>);
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}
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}
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va_end(ap);
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putchar(<span class="synSpecial">'\n'</span>);
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}
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<span class="synType">int</span> main(<span class="synType">void</span>)
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{
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tiny_printf(<span class="synConstant">"sdd"</span>, <span class="synConstant">"result..."</span>, <span class="synConstant">3</span>, <span class="synConstant">5</span>);
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<span class="synStatement">return</span> <span class="synConstant"></span>;
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}
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</pre>
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</div>
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