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| <h3 class="section">1.19 <code>fdim</code>, <code>fdimf</code>–positive difference</h3> |
| |
| <p><a name="index-fdim-47"></a><a name="index-fdimf-48"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <math.h> |
| double fdim(double <var>x</var>, double <var>y</var>); |
| float fdimf(float <var>x</var>, float <var>y</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| The <code>fdim</code> functions determine the positive difference between their |
| arguments, returning: |
| <pre class="smallexample"> <var>x</var> - <var>y</var> if <var>x</var> > <var>y</var>, or |
| </pre> |
| <pre class="smallexample"> +0 if <var>x</var> <= <var>y</var>, or |
| </pre> |
| <pre class="smallexample"> NAN if either argument is NAN. |
| </pre> |
| <p>A range error may occur. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The <code>fdim</code> functions return the positive difference value. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C, POSIX. |
| |
| <p><br> |
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