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89 lines
3.2 KiB
HTML
89 lines
3.2 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>atan (LIBM)</title>
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<meta name="description" content="atan (LIBM)">
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<meta name="keywords" content="atan (LIBM)">
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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="atan2.html#atan2" rel="next" title="atan2">
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</head>
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<body lang="en">
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<a name="atan"></a>
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<div class="header">
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<p>
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Next: <a href="atan2.html#atan2" accesskey="n" rel="next">atan2</a>, Previous: <a href="asinh.html#asinh" accesskey="p" rel="prev">asinh</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="atan_002c-atanf_002d_002d_002darc-tangent"></a>
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<h3 class="section">1.7 <code>atan</code>, <code>atanf</code>—arc tangent</h3>
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<a name="index-atan"></a>
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<a name="index-atanf"></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 atan(double <var>x</var>);
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float atanf(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>atan</code> computes the inverse tangent (arc tangent) of the input value.
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</p>
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<p><code>atanf</code> is identical to <code>atan</code>, save that it operates 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>atan</code> returns a value in radians, in the range of -pi/2 to pi/2.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>atan</code> is ANSI C. <code>atanf</code> is an extension.
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</p>
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<br>
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</body>
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</html>
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