89 lines
5.5 KiB
HTML
89 lines
5.5 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<title>std::gcd</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_numeric_gcd skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>gcd</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-numeric.html">numeric</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<td>
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<div>定义于头文件 <code><a href="cpp-header-numeric.html"><numeric></a></code></div>
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<td></td>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> M, <span class="kw1">class</span> N<span class="sy1">></span><br />
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<span class="kw4">constexpr</span> <a href="cpp-types-common_type.html"><span class="kw636">std::<span class="me2">common_type_t</span></span></a><span class="sy1"><</span>M, N<span class="sy1">></span> gcd<span class="br0">(</span>M m, N n<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>计算整数 <code>m</code> 与 <code>n</code> 的最大公约数。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>m, n</td>
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<td>-</td>
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<td>整数值</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>若 <code>m</code> 与 <code>n</code> 均为零则返回零。否则返回 <code>|m|</code> 与 <code>|n|</code> 的最大公约数。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>若 <code>M</code> 或 <code>N</code> 不是整数类型，或者若其中之一是（可有 cv 限定的） <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span> ，则程序为病式。</p>
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<p>若 <code>|m|</code> 或 <code>|n|</code> 不能表示为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-types-common_type.html"><span class="kw636">std::<span class="me2">common_type_t</span></span></a><span class="sy1"><</span>M, N<span class="sy1">></span></span></span> 类型的值，则行为未定义。</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>不抛异常。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <numeric></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
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<span class="kw4">constexpr</span> <span class="kw4">int</span> p <span class="br0">{</span><span class="nu0">2</span> <span class="sy2">*</span> <span class="nu0">2</span> <span class="sy2">*</span> <span class="nu0">3</span><span class="br0">}</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> <span class="kw4">int</span> q <span class="br0">{</span><span class="nu0">2</span> <span class="sy2">*</span> <span class="nu0">3</span> <span class="sy2">*</span> <span class="nu0">3</span><span class="br0">}</span><span class="sy4">;</span>
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static_assert<span class="br0">(</span><span class="nu0">2</span> <span class="sy2">*</span> <span class="nu0">3</span> <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">gcd</span><span class="br0">(</span>p, q<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-numeric-lcm.html"><span class="t-lines"><span>lcm</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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</div>
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</td>
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<td>返回二个整数最小公倍数的 <code>constexpr</code> 函数模板<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<div class="visualClear"></div>
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</body>
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</html>
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