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| <h3 class="section">1.45 <code>pow</code>, <code>powf</code>—x to the power y</h3> |
| |
| <p><a name="index-pow-125"></a><a name="index-powf-126"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double pow(double <var>x</var>, double <var>y</var>); |
| float powf(float <var>x</var>, float <var>y</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>pow</code> and <code>powf</code> calculate <var>x</var> raised to the exponent <var>y</var>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| On success, <code>pow</code> and <code>powf</code> return the value calculated. |
| |
| <p>When the argument values would produce overflow, <code>pow</code> |
| returns <code>HUGE_VAL</code> and set <code>errno</code> to <code>ERANGE</code>. If the |
| argument <var>x</var> passed to <code>pow</code> or <code>powf</code> is a negative |
| noninteger, and <var>y</var> is also not an integer, then <code>errno</code> |
| is set to <code>EDOM</code>. If <var>x</var> and <var>y</var> are both 0, then |
| <code>pow</code> and <code>powf</code> return <code>1</code>. |
| |
| <p>You can modify error handling for these functions using <code>matherr</code>. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>pow</code> is ANSI C. <code>powf</code> is an extension. |
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