atan2f---arc tangent of y/x
#include <math.h> double atan2(double y,double x); float atan2f(float y,float x);
atan2 computes the inverse tangent (arc tangent) of y/x.
atan2 produces the correct result even for angles near
(that is, when x is near 0).
atan2f is identical to
atan2, save that it takes and returns
atan2f return a value in radians, in the range of
If both x and y are 0.0,
atan2 causes a
You can modify error handling for these functions using
atan2 is ANSI C.
atan2f is an extension.
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