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Man Pages

Subroutines
Browse in : All > Documents > Man Pages > Subroutines (8513)

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 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

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

SEE ALSO

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