using System;

​

interface PhoneCarrier // Target Interface

{

    void rate();

}

​

abstract public class AirtelLocal : PhoneCarrier //Adapter Class

{

    virtual public void rate()

    {

        int x = 0, y;

        Console.WriteLine("Enter number of minutes : ");

        y = Convert.ToInt32(Console.ReadLine());

        x = y * 0.30;

        Console.WriteLine("Total rate :", +x);

    }

}

​

public class AirtelInternational : AirtelLocal //Adaptee Class

{

    override public void rate()

    {

        int x = 0, y;

        Console.WriteLine("Enter number of minutes : ");

        y = Convert.ToInt32(Console.ReadLine());

        x = y * 2.5;

        Console.WriteLine("Total rate :" + x);

    }

}

​

public class program //Client

{

    public static void Main()

    {

        AirtelInternational n = new AirtelInternational();

        Console.WriteLine("Rate Calculation for Airtel International customers ");

        n.rate();

    }

} //ADAPTER PATTERN

​