multi criteria IF statement

[David Hayden]

Don't forget to handle points on the vertical axis, including the origin. I'll arbitrarily assign 0 to atan(0,0). I haven't had nearly enough coffee yet and I'm not fluent in PPL, but in C++:

Code:

        if (x==0) {
            if (y == 0)
                n = 0;      // at the origin
            else
                n = 90 + 180*(y<0);  // on the y axis
        } else {
            // C++ atan() returns radians, so convert to degrees
            n = atan(y/x) * 180 / 3.141592653589792; // assume 1st quadrant
            if (x < 0) n += 180;    // adjust for quadrants 2 and 3
            else if (y < 0) n += 360; // adjust for quadrant 4
        }