ATAN2

NAME

atan2, atan2f, atan2l - arc tangent function of two variables

SYNOPSIS

#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

The fBatan2()fP function calculates the arc tangent of the two variables fIxfP and fIyfP. It is similar to calculating the arc tangent of fIyfP / fIxfP, except that the signs of both arguments are used to determine the quadrant of the result.

RETURN VALUE

The fBatan2()fP function returns the result in radians, which is between -PI and PI (inclusive).

CONFORMING TO

SVID 3, POSIX, BSD 4.3, ISO 9899. The float and long double variants are C99 requirements.