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<a name="atan_002c-atanf_002d_002d_002darc-tangent"></a>
<h3 class="section">1.7 <code>atan</code>, <code>atanf</code>&mdash;arc tangent</h3>
<a name="index-atan"></a>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double atan(double <var>x</var>);
float atanf(float <var>x</var>);

</pre></div>
<p><strong>Description</strong><br>
</p>
<p><code>atan</code> computes the inverse tangent (arc tangent) of the input value.
</p>
<p><code>atanf</code> is identical to <code>atan</code>, save that it operates on <code>floats</code>.
</p>
<br>
<p><strong>Returns</strong><br>
<code>atan</code> returns a value in radians, in the range of -pi/2 to pi/2.
</p>
<br>
<p><strong>Portability</strong><br>
<code>atan</code> is ANSI C.  <code>atanf</code> is an extension.
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