Multiple Polymorphisim

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Demos

{

    // step 1 (1)

    interface InterfaceA

    {

        int add(int a, int b);

        int Multi(int x, int y);

    }

    //Step 1(b)

    interface InterfaceB

    {

        int add(int a, int b);

        int Sub(int x, int y);

    }

    //Step 2

    class MultiInterfaces : InterfaceA, InterfaceB

    {

        int InterfaceA.add(int a, int b)

        {

            return a + b;

        }

        int InterfaceA.Multi(int x, int y)

        {

            return x * y;

        }

        int InterfaceB.add(int a, int b)

        {

            return a + b + 200;

        }

        int InterfaceB.Sub(int x, int y)

        {

            return x - y;

        }

    }

    //Step 3

    //Calling the methods from the inherited classf from step 2

    class ClsTestInterfaces : MultiInterfaces

    {

        static void Main()

        {

            //MultiInterfaces objMulIntf = new MultiInterfaces();

          
             //Runtime polymorphism

            InterfaceA ia = new MultiInterfaces();

            InterfaceB ib = new MultiInterfaces();

            Console.WriteLine("{0}",ia.add(10,20));

            Console.WriteLine("{0}", ia.Multi(10, 20));

            Console.WriteLine("{0}", ib.add(10, 20));

            Console.WriteLine("{0}", ib.Sub(10, 20));

            Console.ReadLine();

        }

    }

}