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| <h3 class="section">1.41 <code>modf</code>, <code>modff</code>—split fractional and integer parts</h3> |
| |
| <p><a name="index-modf-117"></a><a name="index-modff-118"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double modf(double <var>val</var>, double *<var>ipart</var>); |
| float modff(float <var>val</var>, float *<var>ipart</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>modf</code> splits the double <var>val</var> apart into an integer part |
| and a fractional part, returning the fractional part and |
| storing the integer part in <code>*</code><var>ipart</var>. No rounding |
| whatsoever is done; the sum of the integer and fractional |
| parts is guaranteed to be exactly equal to <var>val</var>. That |
| is, if <var>realpart</var> = modf(<var>val</var>, &<var>intpart</var>); then |
| `<var>realpart</var><code>+</code><var>intpart</var>' is the same as <var>val</var>. |
| <code>modff</code> is identical, save that it takes and returns |
| <code>float</code> rather than <code>double</code> values. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The fractional part is returned. Each result has the same |
| sign as the supplied argument <var>val</var>. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>modf</code> is ANSI C. <code>modff</code> is an extension. |
| |
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