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89 lines
3.3 KiB
HTML
89 lines
3.3 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>acos (LIBM)</title>
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<meta name="description" content="acos (LIBM)">
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<meta name="keywords" content="acos (LIBM)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Math.html#Math" rel="up" title="Math">
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<link href="acosh.html#acosh" rel="next" title="acosh">
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<link href="version.html#version" rel="prev" title="version">
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</head>
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<body lang="en">
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<a name="acos"></a>
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<div class="header">
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<p>
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Next: <a href="acosh.html#acosh" accesskey="n" rel="next">acosh</a>, Previous: <a href="version.html#version" accesskey="p" rel="prev">version</a>, Up: <a href="Math.html#Math" accesskey="u" rel="up">Math</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="acos_002c-acosf_002d_002d_002darc-cosine"></a>
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<h3 class="section">1.3 <code>acos</code>, <code>acosf</code>—arc cosine</h3>
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<a name="index-acos"></a>
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<a name="index-acosf"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <math.h>
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double acos(double <var>x</var>);
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float acosf(float <var>x</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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</p>
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<p><code>acos</code> computes the inverse cosine (arc cosine) of the input value.
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Arguments to <code>acos</code> must be in the range -1 to 1.
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</p>
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<p><code>acosf</code> is identical to <code>acos</code>, except that it performs
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its calculations on <code>floats</code>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>acos</code> and <code>acosf</code> return values in radians, in the range of 0 to pi.
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</p>
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<p>If <var>x</var> is not between -1 and 1, the returned value is NaN
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(not a number), and the global variable <code>errno</code> is set to <code>EDOM</code>.
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</p>
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<br>
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</body>
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</html>
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