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<h3 class="section">4.6 Testing for Odd and Even Numbers</h3>
<div class="defun">
— Macro: <b>GSL_IS_ODD</b> (<var>n</var>)<var><a name="index-GSL_005fIS_005fODD-120"></a></var><br>
<blockquote><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></blockquote></div>
<div class="defun">
— Macro: <b>GSL_IS_EVEN</b> (<var>n</var>)<var><a name="index-GSL_005fIS_005fEVEN-121"></a></var><br>
<blockquote><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></blockquote></div>
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