ATAN2(3) BSD Programmer's Manual ATAN2(3)[top]NAMEatan2,atan2f- arc tangent functions of two variablesSYNOPSIS#include <math.h> double atan2(double y, double x); float atan2f(float y, float x);DESCRIPTIONThe atan2() and the atan2f() functions compute the principal value of the arc tangent of y/x, in the range [, +pi] radians, using the signs of both arguments to determine the quadrant of the return value. For a dis- cussion of error reporting, see math(3).-piERRORSIf x = 0 and y = 0 then: _IEEE_ The return value is 0. _POSIX_ Same as _IEEE_, but errno is also set to EDOM. _XOPEN_ Same as _POSIX_, but errno is only set if matherr(3) returns 0. The exception type is DOMAIN. _SVID_ Same as _XOPEN_, and a message is printed to stderr if errno is set.SEE ALSOacos(3), asin(3), atan(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3), tanh(3)STANDARDSThe atan2() function conforms to ANSI C X3.159-1989 (``ANSI C '').BSDI BSD/OS February 17, 1998 1

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