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96 lines
3.5 KiB
HTML
96 lines
3.5 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>round (LIBM)</title>
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<meta name="description" content="round (LIBM)">
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<meta name="keywords" content="round (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="scalbn.html#scalbn" rel="next" title="scalbn">
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<link href="rint.html#rint" rel="prev" title="rint">
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</head>
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<body lang="en">
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<a name="round"></a>
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<div class="header">
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<p>
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Next: <a href="scalbn.html#scalbn" accesskey="n" rel="next">scalbn</a>, Previous: <a href="rint.html#rint" accesskey="p" rel="prev">rint</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="round_002c-roundf_002d_002d_002dround-to-integer_002c-to-nearest"></a>
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<h3 class="section">1.50 <code>round</code>, <code>roundf</code>—round to integer, to nearest</h3>
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<a name="index-round"></a>
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<a name="index-roundf"></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 round(double <var>x</var>);
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float roundf(float <var>x</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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The <code>round</code> functions round their argument to the nearest integer
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value in floating-point format, rounding halfway cases away from zero,
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regardless of the current rounding direction. (While the "inexact"
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floating-point exception behavior is unspecified by the C standard, the
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<code>round</code> functions are written so that "inexact" is not raised if the
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result does not equal the argument, which behavior is as recommended by
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IEEE 754 for its related functions.)
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<var>x</var> rounded to an integral value.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C, POSIX
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</p>
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<br>
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<p><strong>See Also</strong><br>
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<code>nearbyint</code>, <code>rint</code>
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</p>
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<br>
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</body>
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