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| <h3 class="section">1.50 <code>scalbn</code>, <code>scalbnf</code>, <code>scalbln</code>, <code>scalblnf</code>–scale by power of FLT_RADIX (=2)</h3> |
| |
| <p><a name="index-scalbn-135"></a><a name="index-scalbnf-136"></a><a name="index-scalbln-137"></a><a name="index-scalblnf-138"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double scalbn(double <var>x</var>, int <var>n</var>); |
| float scalbnf(float <var>x</var>, int <var>n</var>); |
| double scalbln(double <var>x</var>, long int <var>n</var>); |
| float scalblnf(float <var>x</var>, long int <var>n</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| The <code>scalbn</code> and <code>scalbln</code> functions compute |
| <var>x</var> times FLT_RADIX to the power <var>n</var>. |
| efficiently. The result is computed by manipulating the exponent, rather than |
| by actually performing an exponentiation or multiplication. In this |
| floating-point implementation FLT_RADIX=2, which makes the <code>scalbn</code> |
| functions equivalent to the <code>ldexp</code> functions. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| <var>x</var> times 2 to the power <var>n</var>. A range error may occur. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C, POSIX |
| |
| <p><br> |
| <strong>See Also</strong><br> |
| <code>ldexp</code> |
| |
| <p><br> |
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