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<a name="copysign_002c-copysignf_002d_002d_002dsign-of-y_002c-magnitude-of-x"></a>
<h3 class="section">1.12 <code>copysign</code>, <code>copysignf</code>&mdash;sign of <var>y</var>, magnitude of <var>x</var></h3>
<a name="index-copysign"></a>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double copysign (double <var>x</var>, double <var>y</var>);
float copysignf (float <var>x</var>, float <var>y</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>copysign</code> constructs a number with the magnitude (absolute value)
of its first argument, <var>x</var>, and the sign of its second argument,
<var>y</var>.
</p>
<p><code>copysignf</code> does the same thing; the two functions differ only in
the type of their arguments and result.
</p>
<br>
<p><strong>Returns</strong><br>
<code>copysign</code> returns a <code>double</code> with the magnitude of
<var>x</var> and the sign of <var>y</var>.
<code>copysignf</code> returns a <code>float</code> with the magnitude of
<var>x</var> and the sign of <var>y</var>.
</p>
<br>
<p><strong>Portability</strong><br>
<code>copysign</code> is not required by either ANSI C or the System V Interface
Definition (Issue 2).
</p>

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