atan
, atanf
—arc tangent#include <math.h> double atan(double x); float atanf(float x);
Description
atan
computes the inverse tangent (arc tangent) of the input value.
atanf
is identical to atan
, save that it operates on floats
.
Returns
atan
returns a value in radians, in the range of -pi/2 to pi/2.
Portability
atan
is ANSI C. atanf
is an extension.