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97 lines
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<a name="fdim"></a>
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<p>
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Next: <a href="floor.html#floor" accesskey="n" rel="next">floor</a>, Previous: <a href="fabs.html#fabs" accesskey="p" rel="prev">fabs</a>, Up: <a href="Math.html#Math" accesskey="u" rel="up">Math</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="fdim_002c-fdimf_002d_002d_002dpositive-difference"></a>
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<h3 class="section">1.20 <code>fdim</code>, <code>fdimf</code>—positive difference</h3>
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<a name="index-fdim"></a>
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<a name="index-fdimf"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <math.h>
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double fdim(double <var>x</var>, double <var>y</var>);
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float fdimf(float <var>x</var>, float <var>y</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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The <code>fdim</code> functions determine the positive difference between their
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arguments, returning:
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</p><div class="smallexample">
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<pre class="smallexample"> <var>x</var> - <var>y</var> if <var>x</var> > <var>y</var>, or
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</pre></div>
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<div class="smallexample">
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<pre class="smallexample"> +0 if <var>x</var> <= <var>y</var>, or
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</pre></div>
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<div class="smallexample">
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<pre class="smallexample"> NAN if either argument is NAN.
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</pre></div>
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<p>A range error may occur.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The <code>fdim</code> functions return the positive difference value.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C, POSIX.
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