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atan2(3M)		Mathematical Library Functions		     atan2(3M)

NAME
       atan2, atan2f, atan2l - arc tangent function

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double atan2(double y, double x);

       float atan2f(float y, float x);

       long double atan2l(long double y, long double x);

DESCRIPTION
       These  functions compute the principal value of the arc tangent of y/x,
       using the signs of both arguments to  determine	the  quadrant  of  the
       return value.

RETURN VALUES
       Upon  successful	 completion, these functions return the arc tangent of
       y/x in the range [ −pi,pi ] radians.

       If y is ±0 and x is < 0, ±pi is returned.

       If y is ±0 and x is > 0, ±0 is returned.

       If y is < 0 and x is ±0, −pi/2 is returned.

       If y is > 0 and x is ±0, pi/2 is returned.

       If x is 0, a pole error does not occur.

       If either x or y is NaN, a NaN is returned.

       If y is ±0 and x is -0, ±pi is returned.

       If y is ±0 and x is +0, ±0 is returned.

       For finite values of ±y > 0, if x is −Inf,  ±pi is returned.

       For finite values of ±y > 0, if x is +Inf,  ±0 is returned.

       For finite values of x, if y is ±Inf, ±pi/2 is returned.

       If y is ±Inf and x is −Inf, ±3pi/4 is returned.

       If y is ±Inf and x is +Inf, ±pi/4 is returned.

       If both arguments are 0, a domain error does not occur.

ERRORS
       No errors are defined.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Standard			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       atan(3M), isnan(3M), math.h(3HEAD)tan(3M), attributes(5), standards(5)

SunOS 5.11			  12 Jul 2006			     atan2(3M)
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