C# Program to Illustrate Array of Delegates

/*
 * C# Program to Illustrate Array of Delegates
 */
using System;
delegate double Measure(double R);
public class Circle
{
    const double PI = 3.14159;
    public double Diameter(double Radius)
    {
        return Radius * 2;
    }
 
    public double Circumference(double Radius)
    {
        return Diameter(Radius) * PI;
    }
 
    public double Area(double Radius)
    {
        return Radius * Radius * PI;
    }
}
public static class Program
{
    static int Main()
    {
        double R = 10;
        Circle circ = new Circle();
        Measure[] Calc = new Measure[3];
        Calc[0] = new Measure(circ.Diameter);
        double D = Calc[0](R);
        Calc[1] = new Measure(circ.Circumference);
        double C = Calc[1](R);
        Calc[2] = new Measure(circ.Area);
        double A = Calc[2](R);
        Console.WriteLine("Diameter:      {0}", D);
        Console.WriteLine("Circumference: {0}", C);
        Console.WriteLine("Area:          {0}\n", A);
        Console.ReadLine();
        return 0;
    }
}