How do I calculate a point on a circle’s circumference?

Question

How can the following function be implemented in various languages?

Calculate the (x,y) point on the circumference of a circle, given input values of:

Answer 1

Who needs trig when you have complex numbers:

#include 
#include 

#define PI      3.14159265358979323846

typedef complex double Point;

Point point_on_circle ( double radius, double angle_in_degrees, Point centre )
{
    return centre + radius * cexp ( PI * I * ( angle_in_degrees  / 180.0 ) );
}