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/*

 * ====================================================

 * 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

        <>, <>---arc tangent of y/x

   atan2

INDEX

   atan2f

        #include 

        double atan2(double <[y]>,double <[x]>);

        float atan2f(float <[y]>,float <[x]>);

        #include 

        double atan2(<[y]>,<[x]>);

        double <[y]>;

        double <[x]>;

        float <[y]>;

        float <[x]>;

<> produces the correct result even for angles near

@ifnottex

pi/2 or -pi/2

@end ifnottex

@tex

$\pi/2$ or $-\pi/2$

@end tex

(that is, when <[x]> is near 0).

<>.

<> and <> return a value in radians, in the range of

@ifnottex

-pi to pi.

@end ifnottex

@tex

$-\pi$ to $\pi$.

@end tex

<> is ANSI C.  <> is an extension.

 * wrapper atan2(y,x)

 */

#include 

	double atan2(double y, double x)	/* wrapper atan2 */

#else

	double atan2(y,x)			/* wrapper atan2 */

	double y,x;

#endif

{

	return __ieee754_atan2(y,x);

}