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<a name="nan_002c-nanf_002d_002d_002drepresentation-of-_0060_0060Not-a-Number_0027_0027"></a>
<h3 class="section">1.42 <code>nan</code>, <code>nanf</code>&mdash;representation of &ldquo;Not a Number&rdquo;</h3>
<a name="index-nan"></a>
<a name="index-nanf"></a>
<p><strong>Synopsis</strong>
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<pre class="example">#include &lt;math.h&gt;
double nan(const char *<var>unused</var>);
float nanf(const char *<var>unused</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>nan</code> and <code>nanf</code> return an IEEE NaN (Not a Number) in
double- and single-precision arithmetic respectively.  The
argument is currently disregarded.
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