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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [mathfp/] [s_atan.c] - Rev 307
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/* @(#)z_atan.c 1.0 98/08/13 */ /* FUNCTION <<atan>>, <<atanf>>---arc tangent INDEX atan INDEX atanf ANSI_SYNOPSIS #include <math.h> double atan(double <[x]>); float atanf(float <[x]>); TRAD_SYNOPSIS #include <math.h> double atan(<[x]>); double <[x]>; float atanf(<[x]>); float <[x]>; DESCRIPTION <<atan>> computes the inverse tangent (arc tangent) of the input value. <<atanf>> is identical to <<atan>>, save that it operates on <<floats>>. RETURNS @ifnottex <<atan>> returns a value in radians, in the range of -pi/2 to pi/2. @end ifnottex @tex <<atan>> returns a value in radians, in the range of $-\pi/2$ to $\pi/2$. @end tex PORTABILITY <<atan>> is ANSI C. <<atanf>> is an extension. */ /****************************************************************** * Arctangent * * Input: * x - floating point value * * Output: * arctan of x * * Description: * This routine returns the arctan of x. * *****************************************************************/ #include "fdlibm.h" #include "zmath.h" #ifndef _DOUBLE_IS_32BITS double _DEFUN (atan, (double), double x) { switch (numtest (x)) { case NAN: errno = EDOM; return (x); case INF: /* this should check to see if neg NaN or pos NaN... */ return (__PI_OVER_TWO); case 0: return (0.0); default: return (atangent (x, 0, 0, 0)); } } #endif /* _DOUBLE_IS_32BITS */
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