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95 lines
3.6 KiB
HTML
95 lines
3.6 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>copysign (LIBM)</title>
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<meta name="description" content="copysign (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="cosh.html#cosh" rel="next" title="cosh">
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<body lang="en">
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<a name="copysign"></a>
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<div class="header">
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<p>
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Next: <a href="cosh.html#cosh" accesskey="n" rel="next">cosh</a>, Previous: <a href="cbrt.html#cbrt" accesskey="p" rel="prev">cbrt</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="copysign_002c-copysignf_002d_002d_002dsign-of-y_002c-magnitude-of-x"></a>
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<h3 class="section">1.12 <code>copysign</code>, <code>copysignf</code>—sign of <var>y</var>, magnitude of <var>x</var></h3>
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<a name="index-copysign"></a>
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<a name="index-copysignf"></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 copysign (double <var>x</var>, double <var>y</var>);
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float copysignf (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>copysign</code> constructs a number with the magnitude (absolute value)
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of its first argument, <var>x</var>, and the sign of its second argument,
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<var>y</var>.
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</p>
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<p><code>copysignf</code> does the same thing; the two functions differ only in
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the type of their arguments and result.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>copysign</code> returns a <code>double</code> with the magnitude of
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<var>x</var> and the sign of <var>y</var>.
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<code>copysignf</code> returns a <code>float</code> with the magnitude of
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<var>x</var> and the sign of <var>y</var>.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>copysign</code> is not required by either ANSI C or the System V Interface
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Definition (Issue 2).
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</p>
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