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| <h3 class="section">1.32 <code>ldexp</code>, <code>ldexpf</code>—load exponent</h3> |
| |
| <p><a name="index-ldexp-96"></a><a name="index-ldexpf-97"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double ldexp(double <var>val</var>, int <var>exp</var>); |
| float ldexpf(float <var>val</var>, int <var>exp</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>ldexp</code> calculates the value |
| <var>val</var> times 2 to the power <var>exp</var>. |
| <code>ldexpf</code> is identical, save that it takes and returns <code>float</code> |
| rather than <code>double</code> values. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| <code>ldexp</code> returns the calculated value. |
| |
| <p>Underflow and overflow both set <code>errno</code> to <code>ERANGE</code>. |
| On underflow, <code>ldexp</code> and <code>ldexpf</code> return 0.0. |
| On overflow, <code>ldexp</code> returns plus or minus <code>HUGE_VAL</code>. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>ldexp</code> is ANSI. <code>ldexpf</code> is an extension. |
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