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 arg()                   Determine Angle in the Complex Plane

 #include   <complex.h>

 double     arg(z);
 complex    z;                           Complex number

        The arg() function returns the angle of a number in the complex
        plane. The real axis is angle 0, and the imaginary axis is angle
        ./2.

   -------------------------------- Example ---------------------------------

        This example just returns the angle of (5.7, 9.6).

 #include <iostream.h>
 #include <complex.h>

 int main(void)

    double x = 5.7, y = 9.6, angle1;
    complex z = complex(x, y);
    angle1 = arg(z);
    cout << "Angle of z (in radians) = " << ang << "\n";
    return 0;