---

Manual Reference Pages  - ATAN2 (3)

---

NAME

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

CONTENTS

Synopsis
Description

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); 

Link with -lm.

DESCRIPTION

The atan2() function calculates the arc tangent of the two variables x and y. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the quadrant of the result.

RETURN VALUE

The atan2() function returns the result in radians, which is between -PI and PI (inclusive).

CONFORMING TO

SVr4, POSIX.1-2001, 4.3BSD, C89. The float and long double variants are C99 requirements.

SEE ALSO

acos(3), asin(3), atan(3), cos(3), sin(3), tan(3)

---

ATAN2 (3)

2002-07-27

Generated by OpenAsthra.com from man3/atan2.3 using man macros.