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<a name="nan"></a>
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<p>
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Next: <a href="nearbyint.html#nearbyint" accesskey="n" rel="next">nearbyint</a>, Previous: <a href="modf.html#modf" accesskey="p" rel="prev">modf</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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<a name="nan_002c-nanf_002d_002d_002drepresentation-of-_0060_0060Not-a-Number_0027_0027"></a>
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<h3 class="section">1.42 <code>nan</code>, <code>nanf</code>—representation of “Not a Number”</h3>
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<a name="index-nan"></a>
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<a name="index-nanf"></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 nan(const char *<var>unused</var>);
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float nanf(const char *<var>unused</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>nan</code> and <code>nanf</code> return an IEEE NaN (Not a Number) in
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double- and single-precision arithmetic respectively. The
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argument is currently disregarded.
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