90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
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/* @(#)w_sinh.c 5.1 93/09/24 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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/*
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FUNCTION
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<<sinh>>, <<sinhf>>---hyperbolic sine
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INDEX
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sinh
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INDEX
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sinhf
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SYNOPSIS
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#include <math.h>
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double sinh(double <[x]>);
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float sinhf(float <[x]>);
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DESCRIPTION
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<<sinh>> computes the hyperbolic sine of the argument <[x]>.
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Angles are specified in radians. <<sinh>>(<[x]>) is defined as
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@ifnottex
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. (exp(<[x]>) - exp(-<[x]>))/2
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@end ifnottex
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@tex
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$${e^x - e^{-x}}\over 2$$
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@end tex
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<<sinhf>> is identical, save that it takes and returns <<float>> values.
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RETURNS
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The hyperbolic sine of <[x]> is returned.
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When the correct result is too large to be representable (an
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overflow), <<sinh>> returns <<HUGE_VAL>> with the
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appropriate sign, and sets the global value <<errno>> to
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<<ERANGE>>.
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PORTABILITY
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<<sinh>> is ANSI C.
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<<sinhf>> is an extension.
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QUICKREF
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sinh ansi pure
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sinhf - pure
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*/
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/*
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* wrapper sinh(x)
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*/
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#include "fdlibm.h"
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#include <errno.h>
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#ifndef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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double sinh(double x) /* wrapper sinh */
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#else
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double sinh(x) /* wrapper sinh */
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double x;
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#endif
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{
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#ifdef _IEEE_LIBM
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return __ieee754_sinh(x);
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#else
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double z;
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z = __ieee754_sinh(x);
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if(_LIB_VERSION == _IEEE_) return z;
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if(!finite(z)&&finite(x)) {
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/* sinh(finite) overflow */
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errno = ERANGE;
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return ((x>0.0) ? HUGE_VAL : -HUGE_VAL);
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} else
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return z;
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#endif
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */
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