110 lines
5.0 KiB
Markdown
110 lines
5.0 KiB
Markdown
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---
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title: アルゴリズム
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author: kazu634
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date: 2008-04-24
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url: /2008/04/24/_949/
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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:3925;}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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- つれづれ
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---
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<div class="section">
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<p>
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研修で簡単なアルゴリズムを勉強している。まだ前半なのでフローチャートを書いているだけ。これだとちょっとふぬけてしまうので、勉強したフローチャートをCで書いてみた。
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</p>
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<h4>
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値の交換
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</h4>
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<pre class="syntax-highlight">
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<span class="synPreProc">#include </span><span class="synConstant"><stdio.h></span>
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<span class="synType">int</span> main(<span class="synType">void</span>);
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<span class="synType">int</span> main(<span class="synType">void</span>)
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{
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<span class="synType">int</span> x, y, z;
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x = <span class="synConstant">10</span>;
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y = <span class="synConstant">15</span>;
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printf (<span class="synConstant">"Before Swap:</span><span class="synSpecial">\n</span><span class="synConstant">"</span>);
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printf (<span class="synConstant">"x: </span><span class="synSpecial">%2d</span><span class="synConstant"> </span><span class="synSpecial">\n</span><span class="synConstant">"</span>, x);
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printf (<span class="synConstant">"y: </span><span class="synSpecial">%2d</span><span class="synConstant"> </span><span class="synSpecial">\n</span><span class="synConstant">"</span>, y);
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z = x;
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x = y;
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y = z;
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printf (<span class="synConstant">"</span><span class="synSpecial">\n</span><span class="synConstant">After Swap:</span><span class="synSpecial">\n</span><span class="synConstant">"</span>);
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printf (<span class="synConstant">"x: </span><span class="synSpecial">%2d</span><span class="synConstant"> </span><span class="synSpecial">\n</span><span class="synConstant">"</span>, x);
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printf (<span class="synConstant">"y: </span><span class="synSpecial">%2d</span><span class="synConstant"> </span><span class="synSpecial">\n</span><span class="synConstant">"</span>, y);
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}
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</pre>
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<h4>
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三つの値の中から大きな数値を取り出す
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</h4>
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<pre class="syntax-highlight">
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<span class="synPreProc">#include </span><span class="synConstant"><stdio.h></span>
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<span class="synType">int</span> main(<span class="synType">void</span>);
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<span class="synType">int</span> main(<span class="synType">void</span>)
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{
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<span class="synType">int</span> x, y, z;
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<span class="synType">int</span> max;
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x = <span class="synConstant">13</span>;
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y = <span class="synConstant">45</span>;
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z = <span class="synConstant">30</span>;
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max = x;
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<span class="synStatement">if</span> (max <= y) {
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max = y;
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}
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<span class="synStatement">if</span> (max <= z) {
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max = z;
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}
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printf (<span class="synConstant">"max: </span><span class="synSpecial">%2d\n</span><span class="synConstant">"</span>, max);
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}
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</pre>
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<h4>
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1～3までの和を求める
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</h4>
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<pre class="syntax-highlight">
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<span class="synPreProc">#include </span><span class="synConstant"><stdio.h></span>
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<span class="synType">int</span> main(<span class="synType">void</span>);
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<span class="synType">int</span> main(<span class="synType">void</span>)
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{
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<span class="synType">int</span> i, sum;
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sum = <span class="synConstant"></span>;
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<span class="synStatement">for</span> (i = <span class="synConstant"></span>;i <= <span class="synConstant">3</span>;i++) {
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sum = sum + i;
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}
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printf (<span class="synConstant">"sum is: </span><span class="synSpecial">%2d\n</span><span class="synConstant">"</span>, sum);
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}
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</pre>
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<h4>
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配列の要素をすべて足す
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</h4>
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<p>
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冗長だ。配列の要素数を取得できる命令はこれから自習するから、その時にまた振り返ろう。
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</p>
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<pre class="syntax-highlight">
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<span class="synPreProc">#include </span><span class="synConstant"><stdio.h></span>
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<span class="synType">int</span> main(<span class="synType">void</span>);
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<span class="synType">int</span> main(<span class="synType">void</span>)
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{
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<span class="synType">int</span> i[<span class="synConstant">5</span>], sum, j;
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i[<span class="synConstant"></span>] = <span class="synConstant">10</span>;
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i[<span class="synConstant">1</span>] = <span class="synConstant">20</span>;
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i[<span class="synConstant">2</span>] = <span class="synConstant">30</span>;
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i[<span class="synConstant">3</span>] = <span class="synConstant">40</span>;
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i[<span class="synConstant">4</span>] = <span class="synConstant">50</span>;
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sum = <span class="synConstant"></span>;
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<span class="synStatement">for</span> (j = <span class="synConstant"></span>;j <= <span class="synConstant">4</span>; j++) {
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sum = sum + i[j];
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}
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printf (<span class="synConstant">"</span><span class="synSpecial">%2d\n</span><span class="synConstant">"</span>, sum);
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}
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</pre>
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</div>
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