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| <h3 class="section">1.49 <code>round</code>, <code>roundf</code>–round to integer, to nearest</h3> |
| |
| <p><a name="index-round-133"></a><a name="index-roundf-134"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double round(double <var>x</var>); |
| float roundf(float <var>x</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| The <code>round</code> functions round their argument to the nearest integer |
| value in floating-point format, rounding halfway cases away from zero, |
| regardless of the current rounding direction. (While the "inexact" |
| floating-point exception behavior is unspecified by the C standard, the |
| <code>round</code> functions are written so that "inexact" is not raised if the |
| result does not equal the argument, which behavior is as recommended by |
| IEEE 754 for its related functions.) |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| <var>x</var> rounded to an integral value. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C, POSIX |
| |
| <p><br> |
| <strong>See Also</strong><br> |
| <code>nearbyint</code>, <code>rint</code> |
| |
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