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91 lines
3.4 KiB
HTML
91 lines
3.4 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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<html>
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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>exp (LIBM)</title>
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<meta name="description" content="exp (LIBM)">
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<meta name="keywords" content="exp (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="exp10.html#exp10" rel="next" title="exp10">
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<link href="erf.html#erf" rel="prev" title="erf">
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</head>
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<body lang="en">
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<a name="exp"></a>
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<div class="header">
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<p>
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Next: <a href="exp10.html#exp10" accesskey="n" rel="next">exp10</a>, Previous: <a href="erf.html#erf" accesskey="p" rel="prev">erf</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="exp_002c-expf_002d_002d_002dexponential"></a>
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<h3 class="section">1.15 <code>exp</code>, <code>expf</code>—exponential</h3>
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<a name="index-exp"></a>
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<a name="index-expf"></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 exp(double <var>x</var>);
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float expf(float <var>x</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>exp</code> and <code>expf</code> calculate the exponential of <var>x</var>, that is,
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e raised to the power <var>x</var> (where e
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is the base of the natural system of logarithms, approximately 2.71828).
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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>exp</code> and <code>expf</code> return the calculated value.
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If the result underflows, the returned value is <code>0</code>. If the
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result overflows, the returned value is <code>HUGE_VAL</code>. In
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either case, <code>errno</code> is set to <code>ERANGE</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>exp</code> is ANSI C. <code>expf</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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