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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>cosh, <span style="font-size:0.7em; line-height:130%">std::</span>coshf, <span style="font-size:0.7em; line-height:130%">std::</span>coshl</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-numeric.html">numeric</a>&lrm; | <a href="cpp-numeric-math.html">math</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-cmath.html">&lt;cmath&gt;</a></code></div>
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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span> &nbsp; &nbsp; &nbsp; cosh <span class="br0">(</span> <span class="kw4">float</span> arg <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span> &nbsp; &nbsp; &nbsp; coshf<span class="br0">(</span> <span class="kw4">float</span> arg <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span> &nbsp; &nbsp; &nbsp;cosh <span class="br0">(</span> <span class="kw4">double</span> arg <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td rowspan="142">(3)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span> cosh <span class="br0">(</span> <span class="kw4">long</span> <span class="kw4">double</span> arg <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span> coshl<span class="br0">(</span> <span class="kw4">long</span> <span class="kw4">double</span> arg <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span> &nbsp; &nbsp; &nbsp;cosh <span class="br0">(</span> IntegralType arg <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div class="t-li1"><span class="t-li">1-3)</span> &#35745;&#31639; <code>arg</code> &#30340;&#21452;&#26354;&#20313;&#24358;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#25509;&#21463;&#20219;&#20309;<a href="cpp-types-is_integral.html">&#25972;&#25968;&#31867;&#22411;</a>&#21442;&#25968;&#30340;&#37325;&#36733;&#38598;&#25110;&#20989;&#25968;&#27169;&#26495;&#12290;&#31561;&#20215;&#20110; 2) &#65288;&#23558;&#21442;&#25968;&#36716;&#22411;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span></span></span> &#65289;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>arg</td>
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<td>&#28014;&#28857;&#25110;<a href="cpp-types-is_integral.html">&#25972;&#25968;&#31867;&#22411;</a>&#20540;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
&#33509;&#19981;&#20986;&#29616;&#38169;&#35823;&#65292;&#21017;&#36820;&#22238; <code>arg</code> &#30340;&#21452;&#26354;&#20313;&#24358;&#65288; <span class="texhtml" style="white-space: nowrap;">cosh(arg)</span> &#25110; <span class="texhtml" style="white-space: nowrap;"><span class="t-mfrac"></span></span>
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<td>e<span class="t-su">arg<br /></span>+e<span class="t-su">-arg<br /></span></td>
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&#65289;&#12290;
<p>&#33509;&#20986;&#29616;&#19978;&#28322;&#25152;&#33268;&#30340;&#20540;&#22495;&#38169;&#35823;&#65292;&#21017;&#36820;&#22238; <code>+HUGE_VAL</code> &#12289; <code>+HUGE_VALF</code> &#25110; <code>+HUGE_VALL</code> &#12290;</p>
<h3><span class="mw-headline" id=".E9.94.99.E8.AF.AF.E5.A4.84.E7.90.86">&#38169;&#35823;&#22788;&#29702;</span></h3>
<p>&#25253;&#21578; <span class="t-lc"><a href="cpp-numeric-math-math_errhandling.html">math_errhandling</a></span> &#20013;&#25351;&#23450;&#30340;&#38169;&#35823;&#12290;</p>
<p>&#33509;&#23454;&#29616;&#25903;&#25345; IEEE &#28014;&#28857;&#31639;&#26415;&#65288; IEC 60559 &#65289;&#65292;&#21017;</p>
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<li>&#33509;&#21442;&#25968;&#20026; &plusmn;0 &#65292;&#21017;&#36820;&#22238; 1</li>
<li>&#33509;&#21442;&#25968;&#20026; &plusmn;&infin; &#65292;&#21017;&#36820;&#22238; +&infin;</li>
<li>&#33509;&#21442;&#25968;&#20026; NaN &#65292;&#21017;&#36820;&#22238; NaN</li>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#23545;&#20110; IEEE &#20860;&#23481;&#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span></span></span> &#31867;&#22411;&#65292;&#33509; <span class="texhtml" style="white-space: nowrap;">|arg| &gt; 710.5</span> &#65292;&#21017; <code>cosh(arg)</code> &#19978;&#28322;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;cmath&gt;</span>
<span class="co2">#include &lt;cerrno&gt;</span>
<span class="co2">#include &lt;cstring&gt;</span>
<span class="co2">#include &lt;cfenv&gt;</span>
<span class="co2">#pragma STDC FENV_ACCESS ON</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;cosh(1) = &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">cosh</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;cosh(-1) = &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">cosh</span><span class="br0">(</span><span class="sy2">-</span><span class="nu0">1</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;log(sinh(1)+cosh(1)=&quot;</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-numeric-math-log.html"><span class="kw1324">std::<span class="me2">log</span></span></a><span class="br0">(</span><a href="cpp-numeric-math-sinh.html"><span class="kw1340">std::<span class="me2">sinh</span></span></a><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy2">+</span>std<span class="sy4">::</span><span class="me2">cosh</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="co1">// &#29305;&#27530;&#20540;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;cosh(+0) = &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">cosh</span><span class="br0">(</span><span class="nu16">0.0</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;cosh(-0) = &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">cosh</span><span class="br0">(</span><span class="sy2">-</span><span class="nu16">0.0</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="co1">// &#38169;&#35823;&#22788;&#29702;</span>
<span class="kw2">errno</span><span class="sy1">=</span><span class="nu0">0</span><span class="sy4">;</span>
<a href="cpp-numeric-fenv-feclearexcept.html"><span class="kw1449">std::<span class="me2">feclearexcept</span></span></a><span class="br0">(</span><a href="cpp-numeric-fenv-FE_exceptions.html"><span class="kw1460">FE_ALL_EXCEPT</span></a><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;cosh(710.5) = &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">cosh</span><span class="br0">(</span><span class="nu16">710.5</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span><span class="kw2">errno</span> <span class="sy1">==</span> <a href="cpp-error-errno_macros.html"><span class="kw862">ERANGE</span></a><span class="br0">)</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; errno == ERANGE: &quot;</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-string-byte-strerror.html"><span class="kw1161">std::<span class="me2">strerror</span></span></a><span class="br0">(</span><span class="kw2">errno</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span><a href="cpp-numeric-fenv-fetestexcept.html"><span class="kw1450">std::<span class="me2">fetestexcept</span></span></a><span class="br0">(</span><a href="cpp-numeric-fenv-FE_exceptions.html"><span class="kw1464">FE_OVERFLOW</span></a><span class="br0">)</span><span class="br0">)</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; FE_OVERFLOW raised<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
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<pre class="de1">cosh(1) = 1.54308
cosh(-1) = 1.54308
log(sinh(1)+cosh(1)=1
cosh(+0) = 1
cosh(-0) = 1
cosh(710.5) = inf
errno == ERANGE: Numerical result out of range
FE_OVERFLOW raised</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-numeric-math-sinh.html"><span class="t-lines"><span>sinh</span><span>sinhf</span><span>sinhl</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#35745;&#31639;&#21452;&#26354;&#27491;&#24358;&#65288; <span class="mjax" style="display:none">\({\small\sinh{x} }\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">sinh(x)</span> &#65289;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-numeric-math-tanh.html"><span class="t-lines"><span>tanh</span><span>tanhf</span><span>tanhl</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#35745;&#31639;&#21452;&#26354;&#27491;&#20999;&#65288; <span class="mjax" style="display:none">\({\small\tanh{x} }\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">tanh(x)</span> &#65289;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div><a href="cpp-numeric-math-acosh.html"><span class="t-lines"><span>acosh</span><span>acoshf</span><span>acoshl</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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<td>&#35745;&#31639;&#21453;&#21452;&#26354;&#20313;&#24358;&#65288; <span class="mjax" style="display:none">\({\small\operatorname{arcosh}{x} }\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">arcosh(x)</span> &#65289;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-numeric-complex-cosh.html"><span class="t-lines"><span>cosh<span class="t-dsc-small">(std::complex)</span></span></span></a></div>
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<td>&#35745;&#31639;&#22797;&#25968;&#30340;&#21452;&#26354;&#20313;&#24358;&#65288; <span class="mjax" style="display:none">\({\small\cosh{z} }\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">cosh(z)</span> &#65289;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-numeric-valarray-cosh.html"><span class="t-lines"><span>cosh<span class="t-dsc-small">(std::valarray)</span></span></span></a></div>
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<td>&#22312; valarray &#30340;&#27599;&#20010;&#20803;&#32032;&#19978;&#35843;&#29992; <span class="t-lc"><strong class="selflink">std::cosh</strong></span> &#20989;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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