#include <cmath>float atan2(float y, float x);double atan2(double y, double x); long double atan2(long double y, long double x);

The atan2( ) function returns the arc tangent of y/x. It uses the signs of its arguments to compute the quadrant of the return value.

Related functions are asin( ), acos( ), atan( ), tan( ), cos( ), sin( ), sinh( ), cosh( ), and tanh( ).

C(s)C++ Programmer's Reference
C Programming on the IBM PC (C Programmers Reference Guide Series)
ISBN: 0673462897
EAN: 2147483647
Year: 2002
Pages: 539

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