namespace assignment_2_question_4_main_method
{
    public class Circle
    {
        private double radius;
        private const double PI = 3.14159;
        // Constructor (no argument)
        public Circle()
        {
            // insert code here
            radius = 0.0;
        }
        // Constructor
        public Circle(double rad)
        {
            // insert code here
            radius = rad;
        }
        // SetRadius
        public void SetRadius(double rad)
        {
            // insert code here
            radius = rad;
        }
        // GetRadius
        public double GetRadius()
        {
            // insert code here
            return radius;
        }
        // GetArea
        public double GetArea()
        {
            // insert code here
            return PI * (radius * radius);

        }
        // GetCircumference
        public double GetCircumference()
        {
            // insert code here
            return 2 * PI * radius;
        }
    }
}