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<a name="fdim_002c-fdimf_002d_002d_002dpositive-difference"></a>
<h3 class="section">1.20 <code>fdim</code>, <code>fdimf</code>&mdash;positive difference</h3>
<a name="index-fdim"></a>
<a name="index-fdimf"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double fdim(double <var>x</var>, double <var>y</var>);
float fdimf(float <var>x</var>, float <var>y</var>);

</pre></div>
<p><strong>Description</strong><br>
The <code>fdim</code> functions determine the positive difference between their
arguments, returning:
</p><div class="smallexample">
<pre class="smallexample">	<var>x</var> - <var>y</var>	if <var>x</var> &gt; <var>y</var>, or
</pre></div>
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<pre class="smallexample">	+0	if <var>x</var> &lt;= <var>y</var>, or
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<pre class="smallexample">	NAN	if either argument is NAN.
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<p>A range error may occur.
</p>
<br>
<p><strong>Returns</strong><br>
The <code>fdim</code> functions return the positive difference value.
</p>
<br>
<p><strong>Portability</strong><br>
ANSI C, POSIX.
</p>

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