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92 lines
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92 lines
3.4 KiB
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<p>
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Previous: <a href="tanh.html#tanh" accesskey="p" rel="prev">tanh</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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<a name="trunc_002c-truncf_002d_002d_002dround-to-integer_002c-towards-zero"></a>
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<h3 class="section">1.58 <code>trunc</code>, <code>truncf</code>—round to integer, towards zero</h3>
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<a name="index-trunc"></a>
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<a name="index-truncf"></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 trunc(double <var>x</var>);
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float truncf(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>trunc</code> functions round their argument to the integer value, in
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floating format, nearest to but no larger in magnitude than the
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argument, regardless of the current rounding direction. (While the
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"inexact" floating-point exception behavior is unspecified by the C
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standard, the <code>trunc</code> functions are written so that "inexact" is not
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raised if the result does not equal the argument, which behavior is as
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recommended by 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> truncated 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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