2019-03-31 11:00:21 +00:00
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---
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title: 後で絶対に忘れそうだから、メモっておこう
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author: kazu634
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date: 2009-05-31
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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:4627;}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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---
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<div class="section">
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<p>
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char型に数値を入れたときに、int型として扱うには「’0’」を引きます:
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</p>
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<pre class="syntax-highlight">
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<span class="synType">int</span> main(<span class="synType">int</span> argc, <span class="synType">char</span> *argv[]) {
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<span class="synType">char</span> s = <span class="synConstant">'9'</span>;
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printf(<span class="synConstant">"</span><span class="synSpecial">%c</span><span class="synConstant"> </span><span class="synSpecial">%d</span><span class="synConstant"> </span><span class="synSpecial">%d</span><span class="synConstant">"</span>, s, s, (s - <span class="synConstant">'0'</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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<p>
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実行例はこんな感じです:
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</p>
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<pre class="syntax-highlight">
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~/working/tmp_c on simoom634 <span class="synStatement">[</span><span class="synConstant">503</span><span class="synStatement">]</span> $: gcc <span class="synSpecial">-o</span> foo kr_p87.c
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~/working/tmp_c on simoom634 <span class="synStatement">[</span><span class="synConstant">504</span><span class="synStatement">]</span> $: ./foo
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<span class="synConstant">9</span> <span class="synConstant">57</span> <span class="synConstant">9</span>
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</pre>
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2019-04-02 16:06:15 +00:00
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</div>
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