atan2, atan2f---arc tangent of y/x

Synopsis

#include <math.h>
double atan2(double y,double x);
float atan2f(float y,float x);

Description

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 float.

Returns
atan2 and atan2f return a value in radians, in the range of

If both x and y are 0.0, atan2 causes a DOMAIN error.

You can modify error handling for these functions using matherr.

Portability
atan2 is ANSI C. atan2f is an extension.

Go to the first, previous, next, last section, table of contents.