using System;

public class MathStuff

{

  static int Multiply(int a, int b = 0)

  {

    int product = a * b;

    Console.WriteLine("Called Multiply(int, int)");

    return product;

  }

​

  static double Multiply(double a, double b = 5.5)

  {

    double product = a * b;

    Console.WriteLine("Called Multiply(double, double)");

    return product;

  }

  public static void Main()

  {

    Console.WriteLine("Passing one int argument   : {0}", Multiply(4));

    Console.WriteLine("Passing two int arguments  : {0}", Multiply(4, 5));

    Console.WriteLine("Passing one double argument: {0}", Multiply(4.0));

  }

}