using System;

public class Program

{

    public static void sum(int a,int b)

    {

        Console.WriteLine("sum of {0} and {1}={2}" ,a,b,a+b);

    }

        public static void sum(int a,int b, int c )

        {

        Console.WriteLine("sum of {0},{1} and {2}={3}",a,b,c,a+b+c);

        }

​

        public static void sum(double a,int b)

        {

        Console.WriteLine("sum of {0} and {1}=2",a,b,a+b );

        }

        public static void Main()

        {

        sum(10,20);

            sum(20,40,40);

            sum(10.7,50) ;  

        }

}

​