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Next: <a href="Testing-for-Odd-and-Even-Numbers.html#Testing-for-Odd-and-Even-Numbers" accesskey="n" rel="next">Testing for Odd and Even Numbers</a>, Previous: <a href="Small-integer-powers.html#Small-integer-powers" accesskey="p" rel="previous">Small integer powers</a>, Up: <a href="Mathematical-Functions.html#Mathematical-Functions" accesskey="u" rel="up">Mathematical Functions</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Testing-the-Sign-of-Numbers-1"></a>
<h3 class="section">4.5 Testing the Sign of Numbers</h3>

<dl>
<dt><a name="index-GSL_005fSIGN"></a>Macro: <strong>GSL_SIGN</strong> <em>(x)</em></dt>
<dd><p>This macro returns the sign of <var>x</var>. It is defined as <code>((x) &gt;= 0
? 1 : -1)</code>. Note that with this definition the sign of zero is positive
(regardless of its <small>IEEE</small> sign bit).
</p></dd></dl>




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