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91 lines
3.6 KiB
HTML
91 lines
3.6 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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<title>pow (LIBM)</title>
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<meta name="description" content="pow (LIBM)">
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<meta name="keywords" content="pow (LIBM)">
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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="pow10.html#pow10" rel="next" title="pow10">
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</head>
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<body lang="en">
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<a name="pow"></a>
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<div class="header">
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<p>
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Next: <a href="pow10.html#pow10" accesskey="n" rel="next">pow10</a>, Previous: <a href="nextafter.html#nextafter" accesskey="p" rel="prev">nextafter</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="pow_002c-powf_002d_002d_002dx-to-the-power-y"></a>
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<h3 class="section">1.45 <code>pow</code>, <code>powf</code>—x to the power y</h3>
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<a name="index-pow"></a>
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<a name="index-powf"></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 pow(double <var>x</var>, double <var>y</var>);
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float powf(float <var>x</var>, float <var>y</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>pow</code> and <code>powf</code> calculate <var>x</var> raised to the exponent <var>y</var>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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On success, <code>pow</code> and <code>powf</code> return the value calculated.
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</p>
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<p>When the argument values would produce overflow, <code>pow</code>
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returns <code>HUGE_VAL</code> and set <code>errno</code> to <code>ERANGE</code>. If the
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argument <var>x</var> passed to <code>pow</code> or <code>powf</code> is a negative
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noninteger, and <var>y</var> is also not an integer, then <code>errno</code>
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is set to <code>EDOM</code>. If <var>x</var> and <var>y</var> are both 0, then
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<code>pow</code> and <code>powf</code> return <code>1</code>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>pow</code> is ANSI C. <code>powf</code> is an extension.
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</p><br>
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