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atan2

Usage

   #include <math.h>
   double atan2(double y, double x);

   ANSI

Description

   atan2 returns the arc tangent of y/x in the range of -p to p. atan2 uses
   the signs of y and x to determine the quadrant of the return value.

Return Value

   atan2 returns the arc tangent of the input values. If x and y are both 0,
   atan2 sets errno to EDOM and returns 0. Error handling can be modified
   through the function matherr.

See Also

   acos, asin, atan