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<a name="exp_002c-expf_002d_002d_002dexponential"></a>
<h3 class="section">1.15 <code>exp</code>, <code>expf</code>&mdash;exponential</h3>
<a name="index-exp"></a>
<a name="index-expf"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double exp(double <var>x</var>);
float expf(float <var>x</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>exp</code> and <code>expf</code> calculate the exponential of <var>x</var>, that is, 
e raised to the power <var>x</var> (where e
is the base of the natural system of logarithms, approximately 2.71828).
</p>
<br>
<p><strong>Returns</strong><br>
On success, <code>exp</code> and <code>expf</code> return the calculated value.
If the result underflows, the returned value is <code>0</code>.  If the
result overflows, the returned value is <code>HUGE_VAL</code>.  In
either case, <code>errno</code> is set to <code>ERANGE</code>.
</p>
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<p><strong>Portability</strong><br>
<code>exp</code> is ANSI C.  <code>expf</code> is an extension.
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