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‎reference/chrono/make24.html

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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">12h</a></span><span class="p">,</span> <span class="nb">false</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">0h</a></span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">12h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">12h</a></span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">1h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span><span class="n"><a href="duration/op_h.html">3h</a></span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">1h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1L</span><span class="n">VSDyKdEczSvZknSAPEXixErhCHprMcn</span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">3h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">15h</a></span><span class="p">);</span>
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<span class="n"><a href="../cassert/assert.html">assert</a></span><span class="p">(</span><span class="n"><span style="color:#ff0000">chrono::make24</span></span><span class="p">(</span><span class="n"><a href="duration/op_h.html">11h</a></span><span class="p">,</span> <span class="nb">true</span><span class="p">)</span> <span class="o">==</span> <span class="n"><a href="duration/op_h.html">23h</a></span><span class="p">);</span>
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<span class="p">}</span>

‎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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<span itemprop="datePublished" content="2025-07-05T09:22:27">
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2025年07月05日 09時22分27秒
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<span itemprop="datePublished" content="2025-07-05T10:03:12">
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2025年07月05日 10時03分12秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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</thead>
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<tbody>
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<td><code>atoi</code></td>
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<td><code><a href="cstdlib/atoi_atol_atoll.html">atoi</a></code></td>
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<td>文字列を<code>int</code>型に変換する (function)</td>
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<td></td>
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</tr>
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<tr>
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<td><code>atol</code></td>
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<td><code><a href="cstdlib/atoi_atol_atoll.html">atol</a></code></td>
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<td>文字列を<code>long</code>型に変換する (function)</td>
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<td></td>
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</tr>
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<tr>
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<td><code>atoll</code></td>
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<td><code><a href="cstdlib/atoi_atol_atoll.html">atoll</a></code></td>
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<td>文字列を<code>long long</code>型に変換する (function)</td>
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<td>C++11</td>
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‎reference/cstdlib/atoi_atol_atoll.html

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<span itemprop="name"># atoi,atol,atoll</span>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2025-07-05T10:01:28">
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2025年07月05日 10時01分28秒
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が更新
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<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
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<a class="edit" target="_blank" href="https://github.com/cpprefjp/site/edit/master/reference/cstdlib/atoi_atol_atoll.md">
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<span class="fa fa-fw fa-pencil"></span>編集
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<div class="identifier-type">function</div><div class="header">&lt;cstdlib&gt;</div><h2>atoi,atol,atoll</h2>
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<p><div class="codehilite"><pre><span></span><code><span class="kt">int</span> <span class="nf">atoi</span> <span class="p">(</span> <span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">str</span> <span class="p">);</span>
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<span class="kt">long</span> <span class="nf">atol</span> <span class="p">(</span> <span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">str</span> <span class="p">);</span>
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<span class="kt">long</span> <span class="kt">long</span> <span class="nf">atoll</span><span class="p">(</span> <span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">str</span> <span class="p">);</span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p><code>str</code>を<code>int long long long</code>に変換する。</p>
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<p>基数は常に10である。</p>
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<h2>変換方法</h2>
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<p>空白文字から始まる場合、最初の非空白文字から変換する。</p>
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<p>+ ,-は変換後の符号に適用される。</p>
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<p>変換不可能ならば0を返す.。</p>
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<h2>備考</h2>
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<p>変換後の数値が<a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a>の範囲外の場合、<a class="cpprefjp-defined-word" data-desc="未定義の動作。処理系は予期せぬ動作をする可能性がある。要するに動作保証対象外。undefined behavior (UB)。" href="../../implementation-compliance.html#dfn-undefined-behavior">動作は未定義</a>である。</p>
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<p>名前は、ASCII to integerから命名。</p>
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<h2>例</h2>
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<p><div class="yata" id="9ab591e74c8ad634e355e9a471b3d11d31181f2a"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf">&lt;stdio.h&gt;</span><span class="cp"></span>
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<span class="cp">#include</span> <span class="cpf">&lt;stdlib.h&gt;</span><span class="cp"></span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
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<span class="p">{</span>
237+
<span class="n">printf</span><span class="p">(</span><span class="s">"%i</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">atoi</span><span class="p">(</span><span class="s">" -123junk"</span><span class="p">));</span>
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<span class="n">printf</span><span class="p">(</span><span class="s">"%i</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">atoi</span><span class="p">(</span><span class="s">" +321dust"</span><span class="p">));</span>
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<span class="n">printf</span><span class="p">(</span><span class="s">"%i</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">atoi</span><span class="p">(</span><span class="s">"0"</span><span class="p">));</span>
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<span class="n">printf</span><span class="p">(</span><span class="s">"%i</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">atoi</span><span class="p">(</span><span class="s">"0042"</span><span class="p">));</span> <span class="c1">// 先頭の0を含む10進数として変換</span>
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<span class="n">printf</span><span class="p">(</span><span class="s">"%i</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">atoi</span><span class="p">(</span><span class="s">"0x2A"</span><span class="p">));</span> <span class="c1">// 0のみを変換、"x2A"は破棄される</span>
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<span class="n">printf</span><span class="p">(</span><span class="s">"%i</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">atoi</span><span class="p">(</span><span class="s">"junk"</span><span class="p">));</span> <span class="c1">// 変換不可</span>
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<span class="n">printf</span><span class="p">(</span><span class="s">"%i</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">atoi</span><span class="p">(</span><span class="s">"2147483648"</span><span class="p">));</span> <span class="c1">//intの範囲外</span>
244+
<span class="p">}</span>
245+
</code></pre></div>
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</div></p>
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<h2>出力例</h2>
248+
<p><pre><code>-123
249+
321
250+
0
251+
42
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0
253+
0
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-2147483648
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</code></pre></p>
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<h2>参照</h2>
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<ul>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3220.pdf" target="_blank">7.22.1.2 The atoi, atol, and atoll functions</a></li>
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<li><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2310.pdf" target="_blank">7.22.1.2 The atoi, atol, and atoll functions (p: 249)</a></li>
260+
<li><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n1548.pdf" target="_blank">7.22.1.2 The atoi, atol, and atoll functions (p: 341)</a></li>
261+
<li><a href="https://www.dii.uchile.cl/~daespino/files/Iso_C_1999_definition.pdf" target="_blank">7.20.1.2 The atoi, atol, and atoll functions (p: 307)</a></li>
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<li><a href="https://www.dii.uchile.cl/~daespino/files/Iso_C_1999_definition.pdf" target="_blank">4.10.1.2 The atoi function</a></li>
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