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| <h3 class="section">1.7 <code>atan</code>, <code>atanf</code>—arc tangent</h3> |
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| <p><a name="index-atan-13"></a><a name="index-atanf-14"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double atan(double <var>x</var>); |
| float atanf(float <var>x</var>); |
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| </pre> |
| <p><strong>Description</strong><br> |
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| <p><code>atan</code> computes the inverse tangent (arc tangent) of the input value. |
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| <p><code>atanf</code> is identical to <code>atan</code>, save that it operates on <code>floats</code>. |
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| <p><br> |
| <strong>Returns</strong><br> |
| <code>atan</code> returns a value in radians, in the range of -pi/2 to pi/2. |
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| <p><br> |
| <strong>Portability</strong><br> |
| <code>atan</code> is ANSI C. <code>atanf</code> is an extension. |
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