klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

上传cppreference

Browse Source
This commit is contained in:
klarkxy
2025-08-01 12:57:54 +08:00
parent e29892f8cd
commit 196e706fe4
5485 changed files with 982007 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

252
web/cppreference-zh/chmhelp/c-numeric-math-cos.html Normal file
View File

@@ -0,0 +1,252 @@
<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>cos, cosf, cosl</title>
<link rel="stylesheet" href="ext.css" />
<link rel="stylesheet" href="site_modules.css" />
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_numeric_math_cos skin-cppreference2 action-view cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading">cos, cosf, cosl</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="c.html">c</a>&lrm; | <a href="c-numeric.html">numeric</a>&lrm; | <a href="c-numeric-math.html">math</a></span></div>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<table class="t-dcl-begin">
<tbody>
<tr class="t-dsc-header">
<td>
<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;math.h&gt;</code></div>
</td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-c99">
<td>
<div><span class="mw-geshi c source-c"><span class="kw4">float</span> &nbsp; &nbsp; &nbsp; cosf<span class="br0">(</span> <span class="kw4">float</span> arg <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(1)</td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
</tr>
<tr class="t-dcl">
<td>
<div><span class="mw-geshi c source-c"><span class="kw4">double</span> &nbsp; &nbsp; &nbsp;cos<span class="br0">(</span> <span class="kw4">double</span> arg <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td>(2)</td>
<td class="t-dcl-nopad"></td>
</tr>
<tr class="t-dcl t-since-c99">
<td>
<div><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span> cosl<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>
</td>
<td>(3)</td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
</tr>
<tr class="t-dsc-header">
<td>
<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;tgmath.h&gt;</code></div>
</td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-c99">
<td>
<div><span class="mw-geshi c source-c"><span class="co2">#define cos( arg )</span></span></div>
</td>
<td>(4)</td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<div class="t-li1"><span class="t-li">1-3)</span> &#35745;&#31639; <code>arg</code> &#65288;&#20197;&#24359;&#24230;&#35745;&#37327;&#65289;&#30340;&#20313;&#24358;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#27867;&#22411;&#23439;&#65306;&#33509;&#21442;&#25968;&#25317;&#26377; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">long</span> <span class="kw4">double</span></span></span> &#31867;&#22411;&#65292;&#21017;&#35843;&#29992; <code>cosl</code> &#12290;&#21542;&#21017;&#65292;&#33509;&#21442;&#25968;&#25317;&#26377;&#25972;&#25968;&#31867;&#22411;&#25110; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">double</span></span></span> &#31867;&#22411;&#65292;&#21017;&#35843;&#29992; <code>cos</code> &#12290;&#21542;&#21017;&#65292;&#35843;&#29992; <code>cosf</code> &#12289;&#33509;&#21442;&#25968;&#20026;&#22797;&#25968;&#65292;&#21017;&#35813;&#23439;&#35843;&#29992;&#23545;&#24212;&#30340;&#22797;&#20989;&#25968;&#65288; <span class="t-c"><span class="mw-geshi c source-c"><a href="c-numeric-complex-ccos.html"><span class="kw790">ccosf</span></a></span></span> &#12289; <span class="t-c"><span class="mw-geshi c source-c"><a href="c-numeric-complex-ccos.html"><span class="kw789">ccos</span></a></span></span> &#12289; <span class="t-c"><span class="mw-geshi c source-c"><a href="c-numeric-complex-ccos.html"><span class="kw791">ccosl</span></a></span></span> &#65289;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>arg</td>
<td>-</td>
<td>&#20197;&#24359;&#24230;&#34920;&#31034;&#35282;&#30340;&#28014;&#28857;&#20540;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#33509;&#19981;&#20986;&#29616;&#38169;&#35823;&#65292;&#21017;&#36820;&#22238; <code>arg</code> &#30340;&#20313;&#24358;&#65288; <span class="texhtml" style="white-space: nowrap;">cos(arg)</span> &#65289;&#65292;&#22312;&#33539;&#22260; <span class="texhtml" style="white-space: nowrap;">[-1&nbsp;; +1]</span> &#20013;&#12290;</p>
<table class="t-rev-begin">
<tr class="t-rev t-until-c99">
<td>
<p>&#33509; <code>arg</code> &#30340;&#32477;&#23545;&#20540;&#24456;&#22823;&#65292;&#21017;&#32467;&#26524;&#21487;&#33021;&#25317;&#26377;&#23569;&#37327;&#25110;&#26080;&#26377;&#25928;&#25968;&#23383;&#12290;</p>
</td>
<td><span class="t-mark-rev t-until-c99">(C99 &#21069;)</span></td>
</tr>
</table>
<p>&#33509;&#20986;&#29616;&#23450;&#20041;&#22495;&#38169;&#35823;&#65292;&#21017;&#36820;&#22238;&#23454;&#29616;&#23450;&#20041;&#20540;&#65288;&#21463;&#25903;&#25345;&#24179;&#21488;&#19978;&#20026; NaN &#65289;&#12290;</p>
<p>&#33509;&#20986;&#29616;&#19979;&#28322;&#25152;&#33268;&#30340;&#20540;&#22495;&#38169;&#35823;&#65292;&#21017;&#36820;&#22238;&#65288;&#33293;&#20837;&#21518;&#30340;&#65289;&#27491;&#30830;&#30340;&#32467;&#26524;&#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; <a href="c-numeric-math-math_errhandling.html"><tt>math_errhandling</tt></a> &#20013;&#25351;&#23450;&#30340;&#38169;&#35823;&#12290;</p>
<p>&#33509;&#23454;&#29616;&#25903;&#25345; IEEE &#28014;&#28857;&#31639;&#26415;&#65288; IEC 60559 &#65289;&#65292;</p>
<ul>
<li>&#21017;&#33509;&#21442;&#25968;&#20026; &plusmn;0 &#65292;&#21017;&#32467;&#26524;&#20026; 1.0</li>
<li>&#33509;&#21442;&#25968;&#20026; &plusmn;&infin; &#65292;&#21017;&#36820;&#22238; NaN &#24182;&#24341;&#21457; <span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_INVALID</a></span></li>
<li>&#33509;&#21442;&#25968;&#20026; NaN &#65292;&#21017;&#36820;&#22238; NaN</li>
</ul>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">&#27880;&#24847;</span></h3>
<p>&#21442;&#25968;&#20026;&#26080;&#31351;&#22823;&#30340;&#24773;&#20917;&#19981;&#34987;&#25351;&#23450;&#20026; C &#20013;&#30340;&#23450;&#20041;&#22495;&#38169;&#35823;&#65292;&#20294;&#34987;&#23450;&#20041;&#20026; <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/cos.html">POSIX &#20013;&#30340;&#23450;&#20041;&#22495;&#38169;&#35823;</a>&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="c source-c">
<pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;math.h&gt;</span>
<span class="co2">#include &lt;errno.h&gt;</span>
<span class="co2">#include &lt;fenv.h&gt;</span>
<span class="co2">#pragma STDC FENV_ACCESS ON</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">double</span> pi <span class="sy1">=</span> <a href="c-numeric-math-acos.html"><span class="kw672">acos</span></a><span class="br0">(</span><span class="sy2">-</span><span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#20856;&#22411;&#29992;&#27861;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;cos(pi/3) = %f<span class="es1">\n</span>&quot;</span>, cos<span class="br0">(</span>pi<span class="sy2">/</span><span class="nu0">3</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;cos(pi/2) = %f<span class="es1">\n</span>&quot;</span>, cos<span class="br0">(</span>pi<span class="sy2">/</span><span class="nu0">2</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;cos(-3*pi/4) = %f<span class="es1">\n</span>&quot;</span>, cos<span class="br0">(</span><span class="sy2">-</span><span class="nu0">3</span><span class="sy2">*</span>pi<span class="sy2">/</span><span class="nu0">4</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#29305;&#27530;&#20540;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;cos(+0) = %f<span class="es1">\n</span>&quot;</span>, cos<span class="br0">(</span><span class="nu16">0.0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;cos(-0) = %f<span class="es1">\n</span>&quot;</span>, cos<span class="br0">(</span><span class="sy2">-</span><span class="nu16">0.0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#38169;&#35823;&#22788;&#29702;</span>
<a href="c-numeric-fenv-feclearexcept.html"><span class="kw717">feclearexcept</span></a><span class="br0">(</span><a href="c-numeric-fenv-FE_exceptions.html"><span class="kw728">FE_ALL_EXCEPT</span></a><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;cos(INFINITY) = %f<span class="es1">\n</span>&quot;</span>, cos<span class="br0">(</span>INFINITY<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span><a href="c-numeric-fenv-fetestexcept.html"><span class="kw718">fetestexcept</span></a><span class="br0">(</span><a href="c-numeric-fenv-FE_exceptions.html"><span class="kw731">FE_INVALID</span></a><span class="br0">)</span><span class="br0">)</span> <a href="c-io-puts.html"><span class="kw835">puts</span></a><span class="br0">(</span><span class="st0">&quot; FE_INVALID raised&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">cos(pi/3) = 0.500000
cos(pi/2) = 0.000000
cos(-3*pi/4) = -0.707107
cos(+0) = 1.000000
cos(-0) = 1.000000
cos(INFINITY) = -nan
FE_INVALID raised</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
<div class="t-ref-std-11">
<ul>
<li>C11 &#26631;&#20934;&#65288;ISO/IEC 9899:2011&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.12.4.5 The cos functions (p: 239)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>7.25 Type-generic math &lt;tgmath.h&gt; (p: 373-375)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>F.10.1.5 The cos functions (p: 519)</li>
</ul>
</dd>
</dl>
<div class="t-ref-std-c99">
<ul>
<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.12.4.5 The cos functions (p: 220)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>7.22 Type-generic math &lt;tgmath.h&gt; (p: 335-337)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>F.9.1.5 The cos functions (p: 456)</li>
</ul>
</dd>
</dl>
<div class="t-ref-std-c89">
<ul>
<li>C89/C90 &#26631;&#20934;&#65288;ISO/IEC 9899:1990&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>4.5.2.5 The cos function</li>
</ul>
</dd>
</dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-numeric-math-sin.html"><span class="t-lines"><span>sin</span><span>sinf</span><span>sinl</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
</div>
</td>
<td>&#35745;&#31639;&#27491;&#24358;&#65288; <span class="mjax" style="display:none">\({\small\sin{x} }\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">sin(x)</span> &#65289;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-numeric-math-tan.html"><span class="t-lines"><span>tan</span><span>tanf</span><span>tanl</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
</div>
</td>
<td>&#35745;&#31639;&#27491;&#20999;&#65288; <span class="mjax" style="display:none">\({\small\tan{x} }\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">tan(x)</span> &#65289;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-numeric-math-acos.html"><span class="t-lines"><span>acos</span><span>acosf</span><span>acosl</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
</div>
</td>
<td>&#35745;&#31639;&#21453;&#20313;&#24358;&#65288; <span class="mjax" style="display:none">\({\small\arccos{x} }\)</span><span class="mjax-fallback texhtml" style="white-space: nowrap;">arccos(x)</span> &#65289;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-numeric-complex-ccos.html"><span class="t-lines"><span>ccos</span><span>ccosf</span><span>ccosl</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
</div>
</td>
<td>&#35745;&#31639;&#22797;&#25968;&#20313;&#24358;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
</div>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>