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| <h3 class="section">1.15 <code>exp</code>, <code>expf</code>—exponential</h3> |
| |
| <p><a name="index-exp-39"></a><a name="index-expf-40"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double exp(double <var>x</var>); |
| float expf(float <var>x</var>); |
| |
| </pre> |
| <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>You can use the (non-ANSI) function <code>matherr</code> to specify |
| error handling for these functions. |
| |
| <p><br> |
| <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><br> |
| <strong>Portability</strong><br> |
| <code>exp</code> is ANSI C. <code>expf</code> is an extension. |
| |
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