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<a name="Testing-for-Odd-and-Even-Numbers"></a>
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<p>
Next: <a href="Maximum-and-Minimum-functions.html#Maximum-and-Minimum-functions" accesskey="n" rel="next">Maximum and Minimum functions</a>, Previous: <a href="Testing-the-Sign-of-Numbers.html#Testing-the-Sign-of-Numbers" accesskey="p" rel="previous">Testing the Sign of Numbers</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-for-Odd-and-Even-Numbers-1"></a>
<h3 class="section">4.6 Testing for Odd and Even Numbers</h3>

<dl>
<dt><a name="index-GSL_005fIS_005fODD"></a>Macro: <strong>GSL_IS_ODD</strong> <em>(n)</em></dt>
<dd><p>This macro evaluates to 1 if <var>n</var> is odd and 0 if <var>n</var> is
even. The argument <var>n</var> must be of integer type.
</p></dd></dl>

<dl>
<dt><a name="index-GSL_005fIS_005fEVEN"></a>Macro: <strong>GSL_IS_EVEN</strong> <em>(n)</em></dt>
<dd><p>This macro is the opposite of <code>GSL_IS_ODD(n)</code>. It evaluates to 1 if
<var>n</var> is even and 0 if <var>n</var> is odd. The argument <var>n</var> must be of
integer type.
</p></dd></dl>




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