1ATAN2(3)                   Linux Programmer's Manual                  ATAN2(3)
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NAME

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

9       #include <math.h>
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11       double atan2(double y, double x);
12       float atan2f(float y, float x);
13       long double atan2l(long double y, long double x);
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15       Link with -lm.
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DESCRIPTION

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

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

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

32       acos(3), asin(3), atan(3), cos(3), sin(3), tan(3)
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36                                  2002-07-27                          ATAN2(3)
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