0,0 → 1,120 |
|
/* @(#)w_sinh.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 |
<<sinh>>, <<sinhf>>---hyperbolic sine |
|
INDEX |
sinh |
INDEX |
sinhf |
|
ANSI_SYNOPSIS |
#include <math.h> |
double sinh(double <[x]>); |
float sinhf(float <[x]>); |
|
TRAD_SYNOPSIS |
#include <math.h> |
double sinh(<[x]>) |
double <[x]>; |
|
float sinhf(<[x]>) |
float <[x]>; |
|
DESCRIPTION |
<<sinh>> computes the hyperbolic sine of the argument <[x]>. |
Angles are specified in radians. <<sinh>>(<[x]>) is defined as |
@ifnottex |
. (exp(<[x]>) - exp(-<[x]>))/2 |
@end ifnottex |
@tex |
$${e^x - e^{-x}}\over 2$$ |
@end tex |
|
<<sinhf>> is identical, save that it takes and returns <<float>> values. |
|
RETURNS |
The hyperbolic sine of <[x]> is returned. |
|
When the correct result is too large to be representable (an |
overflow), <<sinh>> returns <<HUGE_VAL>> with the |
appropriate sign, and sets the global value <<errno>> to |
<<ERANGE>>. |
|
You can modify error handling for these functions with <<matherr>>. |
|
PORTABILITY |
<<sinh>> is ANSI C. |
<<sinhf>> is an extension. |
|
QUICKREF |
sinh ansi pure |
sinhf - pure |
*/ |
|
/* |
* wrapper sinh(x) |
*/ |
|
#include "fdlibm.h" |
#include <errno.h> |
|
#ifndef _DOUBLE_IS_32BITS |
|
#ifdef __STDC__ |
double sinh(double x) /* wrapper sinh */ |
#else |
double sinh(x) /* wrapper sinh */ |
double x; |
#endif |
{ |
#ifdef _IEEE_LIBM |
return __ieee754_sinh(x); |
#else |
double z; |
struct exception exc; |
z = __ieee754_sinh(x); |
if(_LIB_VERSION == _IEEE_) return z; |
if(!finite(z)&&finite(x)) { |
/* sinh(finite) overflow */ |
#ifndef HUGE_VAL |
#define HUGE_VAL inf |
double inf = 0.0; |
|
SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ |
#endif |
exc.type = OVERFLOW; |
exc.name = "sinh"; |
exc.err = 0; |
exc.arg1 = exc.arg2 = x; |
if (_LIB_VERSION == _SVID_) |
exc.retval = ( (x>0.0) ? HUGE : -HUGE); |
else |
exc.retval = ( (x>0.0) ? HUGE_VAL : -HUGE_VAL); |
if (_LIB_VERSION == _POSIX_) |
errno = ERANGE; |
else if (!matherr(&exc)) { |
errno = ERANGE; |
} |
if (exc.err != 0) |
errno = exc.err; |
return exc.retval; |
} else |
return z; |
#endif |
} |
|
#endif /* defined(_DOUBLE_IS_32BITS) */ |