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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [mathfp/] [s_acos.c] - Rev 179
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/* @(#)z_acos.c 1.0 98/08/13 */ /* FUNCTION <<acos>>, <<acosf>>---arc cosine INDEX acos INDEX acosf ANSI_SYNOPSIS #include <math.h> double acos(double <[x]>); float acosf(float <[x]>); TRAD_SYNOPSIS #include <math.h> double acos(<[x]>) double <[x]>; float acosf(<[x]>) float <[x]>; DESCRIPTION <<acos>> computes the inverse cosine (arc cosine) of the input value. Arguments to <<acos>> must be in the range @minus{}1 to 1. <<acosf>> is identical to <<acos>>, except that it performs its calculations on <<floats>>. RETURNS @ifnottex <<acos>> and <<acosf>> return values in radians, in the range of 0 to pi . @end ifnottex @tex <<acos>> and <<acosf>> return values in radians, in the range of <<0>> t o $\pi$. @end tex If <[x]> is not between @minus{}1 and 1, the returned value is NaN (not a number) the global variable <<errno>> is set to <<EDOM>>, and a <<DOMAIN error>> message is sent as standard error output. You can modify error handling for these functions using <<matherr>>. QUICKREF ANSI SVID POSIX RENTRANT acos y,y,y,m acosf n,n,n,m MATHREF acos, [-1,1], acos(arg),,, acos, NAN, arg,DOMAIN,EDOM MATHREF acosf, [-1,1], acosf(arg),,, acosf, NAN, argf,DOMAIN,EDOM */ /***************************************************************** * Arccosine * * Input: * x - floating point value * * Output: * arccosine of x * * Description: * This routine returns the arccosine of x. * *****************************************************************/ #include "fdlibm.h" #include "zmath.h" #ifndef _DOUBLE_IS_32BITS double _DEFUN (acos, (double), double x) { return (asine (x, 1)); } #endif /* _DOUBLE_IS_32BITS */
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