| 0,0 → 1,107 |
|---|
| |
| /* @(#)w_fmod.c 5.1 93/09/24 */ |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| /* |
| FUNCTION |
| <<fmod>>, <<fmodf>>---floating-point remainder (modulo) |
| |
| INDEX |
| fmod |
| INDEX |
| fmodf |
| |
| ANSI_SYNOPSIS |
| #include <math.h> |
| double fmod(double <[x]>, double <[y]>) |
| float fmodf(float <[x]>, float <[y]>) |
| |
| TRAD_SYNOPSIS |
| #include <math.h> |
| double fmod(<[x]>, <[y]>) |
| double (<[x]>, <[y]>); |
| |
| float fmodf(<[x]>, <[y]>) |
| float (<[x]>, <[y]>); |
| |
| DESCRIPTION |
| The <<fmod>> and <<fmodf>> functions compute the floating-point |
| remainder of <[x]>/<[y]> (<[x]> modulo <[y]>). |
| |
| RETURNS |
| The <<fmod>> function returns the value |
| @ifnottex |
| <[x]>-<[i]>*<[y]>, |
| @end ifnottex |
| @tex |
| $x-i\times y$, |
| @end tex |
| for the largest integer <[i]> such that, if <[y]> is nonzero, the |
| result has the same sign as <[x]> and magnitude less than the |
| magnitude of <[y]>. |
| |
| <<fmod(<[x]>,0)>> returns NaN, and sets <<errno>> to <<EDOM>>. |
| |
| You can modify error treatment for these functions using <<matherr>>. |
| |
| PORTABILITY |
| <<fmod>> is ANSI C. <<fmodf>> is an extension. |
| */ |
| |
| /* |
| * wrapper fmod(x,y) |
| */ |
| |
| #include "fdlibm.h" |
| #include <errno.h> |
| |
| #ifndef _DOUBLE_IS_32BITS |
| |
| #ifdef __STDC__ |
| double fmod(double x, double y) /* wrapper fmod */ |
| #else |
| double fmod(x,y) /* wrapper fmod */ |
| double x,y; |
| #endif |
| { |
| #ifdef _IEEE_LIBM |
| return __ieee754_fmod(x,y); |
| #else |
| double z; |
| struct exception exc; |
| z = __ieee754_fmod(x,y); |
| if(_LIB_VERSION == _IEEE_ ||isnan(y)||isnan(x)) return z; |
| if(y==0.0) { |
| /* fmod(x,0) */ |
| exc.type = DOMAIN; |
| exc.name = "fmod"; |
| exc.arg1 = x; |
| exc.arg2 = y; |
| exc.err = 0; |
| if (_LIB_VERSION == _SVID_) |
| exc.retval = x; |
| else |
| exc.retval = 0.0/0.0; |
| if (_LIB_VERSION == _POSIX_) |
| errno = EDOM; |
| else if (!matherr(&exc)) { |
| errno = EDOM; |
| } |
| if (exc.err != 0) |
| errno = exc.err; |
| return exc.retval; |
| } else |
| return z; |
| #endif |
| } |
| |
| #endif /* defined(_DOUBLE_IS_32BITS) */ |