| 0,0 → 1,61 |
|---|
| /* Copyright (C) 2002 by Red Hat, Incorporated. All rights reserved. |
| * |
| * Permission to use, copy, modify, and distribute this software |
| * is freely granted, provided that this notice is preserved. |
| */ |
| /* |
| FUNCTION |
| <<fdim>>, <<fdimf>>--positive difference |
| INDEX |
| fdim |
| INDEX |
| fdimf |
| |
| ANSI_SYNOPSIS |
| #include <math.h> |
| double fdim(double <[x]>, double <[y]>); |
| float fdimf(float <[x]>, float <[y]>); |
| |
| DESCRIPTION |
| The <<fdim>> functions determine the positive difference between their |
| arguments, returning: |
| . <[x]> - <[y]> if <[x]> > <[y]>, or |
| @ifnottex |
| . +0 if <[x]> <= <[y]>, or |
| @end ifnottex |
| @tex |
| . +0 if <[x]> $\leq$ <[y]>, or |
| @end tex |
| . NAN if either argument is NAN. |
| A range error may occur. |
| |
| RETURNS |
| The <<fdim>> functions return the positive difference value. |
| |
| PORTABILITY |
| ANSI C, POSIX. |
| |
| */ |
| |
| #include "fdlibm.h" |
| |
| #ifndef _DOUBLE_IS_32BITS |
| |
| #ifdef __STDC__ |
| double fdim(double x, double y) |
| #else |
| double fdim(x,y) |
| double x; |
| double y; |
| #endif |
| { |
| int c = __fpclassifyd(x); |
| if (c == FP_NAN) return(x); |
| if (__fpclassifyd(y) == FP_NAN) return(y); |
| if (c == FP_INFINITE) |
| return HUGE_VAL; |
| |
| return x > y ? x - y : 0.0; |
| } |
| |
| #endif /* _DOUBLE_IS_32BITS */ |