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‎reference/cstdlib.html

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<p class="text-right"><small>
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最終更新日時(UTC):
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<td>C++14から非推奨</td>
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<td><code>rand</code></td>
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<td><code><a href="cstdlib/rand.html">rand</a></code></td>
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<td><code>srand</code>で指定されたシードを元に、擬似乱数を生成する (function)</td>
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<td>C++14から非推奨</td>
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‎reference/cstdlib/rand.html

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<div class="identifier-type">function</div><div class="header">&lt;cstdlib&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">rand</span></h1>
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<div itemprop="articleBody"><h2>概要</h2>
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<p><code>0</code>から<code>RAND_MAX</code>までの値の疑似乱数を返す。</p>
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<p><code><a href="srand.html">std::srand()</a></code>関数はこの関数の疑似乱数生成器で使用するシード値を決定する。</p>
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<p>もし<code><a href="srand.html">std::srand()</a></code>の前に、<code>std::rand()</code>が使用された場合、<code>srand(1)</code>として生成される。</p>
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<p>シード値が同じなら、<code>std::rand()</code>も同じ値を返す。</p>
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<p>また、標準ライブラリの複数の関数で<code>std::rand()</code>関数が呼び出される場合がある。</p>
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<p>これは実装に依存している。</p>
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<p>この関数がスレッドセーフであるかどうかも実装に依存している。</p>
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<h2>備考</h2>
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<p>この関数の疑似乱数の品質は保証されていない。</p>
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<p>より安全な乱数を使いたい場合は<code>random</code>ライブラリなどを使用したほうが良い。</p>
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<h2>例</h2>
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<p><div class="yata" id="ce96b5e1535c9a4347617a9bf3f78bdfc46bda9a"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../cstdlib.html">&lt;cstdlib&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../ctime.html">&lt;ctime&gt;</a></span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf"><a href="../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span>
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<span class="p">{</span>
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<span class="n">std</span><span class="o">::</span><span class="n">srand</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">time</span><span class="p">(</span><span class="mi">0</span><span class="p">));</span> <span class="c1">// 現在時刻を疑似乱数のシード値とする。</span>
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<span class="n"><a href="../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">rand</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="sc">'\n'</span><span class="p">;</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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<h2>出力例</h2>
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<p><pre><code>1373858591
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</code></pre></p>
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<h2>関連項目</h2>
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<ul>
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<li><code><a href="srand.html">srand()</a></code>:この関数の疑似乱数生成器で使用するシード値を決定する。</li>
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<li><code><span href="https://cpprefjp.github.io/reference/cstdlib">RAND_MAX</span></code>:この関数で返される疑似乱数の最大値。</li>
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‎reference/cstdlib/srand.html

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2025年07月06日 07時11分54秒
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<span itemprop="datePublished" content="2025-07-06T07:36:36">
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<h2>関連項目</h2>
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<ul>
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<li><code>rand</code>:疑似乱数を生成する</li>
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<li><code><a href="rand.html">rand</a></code>:疑似乱数を生成する</li>
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<li><code>RAND_MAX</code>:<code>std::rand()</code>が返す最高値。</li>
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<li><code>time</code>:時刻を取得する</li>
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<li><code><a href="../ctime/time_t.html">time_t</a></code>:UNIX時間を表すための型。</li>

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