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| <h3 class="section">1.54 <code>sqrt</code>, <code>sqrtf</code>—positive square root</h3> |
| |
| <p><a name="index-sqrt-146"></a><a name="index-sqrtf-147"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double sqrt(double <var>x</var>); |
| float sqrtf(float <var>x</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>sqrt</code> computes the positive square root of the argument. |
| You can modify error handling for this function with |
| <code>matherr</code>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| On success, the square root is returned. If <var>x</var> is real and |
| positive, then the result is positive. If <var>x</var> is real and |
| negative, the global value <code>errno</code> is set to <code>EDOM</code> (domain error). |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>sqrt</code> is ANSI C. <code>sqrtf</code> is an extension. |
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