using System;

using System.Collections.Generic;

using System.Text;

namespace Example07

{

    class Program

    {

        class BaseClass

        {

            public virtual void F()

            {

                Console.WriteLine("BaseClass.F");

            }

        }

        class DeriveClass : BaseClass

        {

            public override void F()

            {

                base.F();

                Console.WriteLine("DeriveClass.F");

            }

            public void Add(int Left, int Right)

            {

                Console.WriteLine("Add for Int: {0}", Left + Right);

            }

            public void Add(double Left, double Right)

            {

                Console.WriteLine("Add for int: {0}", Left + Right);

            }

        }

        static void Main(string[] args)

        {

            DeriveClass tmpObj = new DeriveClass();

            tmpObj.F();

            tmpObj.Add(1, 2);

            tmpObj.Add(1.1, 2.2);

            Console.ReadLine();

        }

    }

}