using System;

​

public abstract class MyClass

{

    public abstract void calculate(double x);

}

class Sub1 : MyClass

{

    public override void calculate(double x)

    {

    Console.WriteLine("Square root is " + Math.Sqrt(x));

    }

}

class Sub2 : MyClass

{

    public override void calculate(double x)

    {

    Console.WriteLine("Square  is " + (x*x));

    }

}

​

class Sub3 : MyClass

{

    public override void calculate(double x)

    {

    Console.WriteLine("Cube  is " + (x*x*x));

    }

}

public class Program

{

    public static void Main()

    {

        Sub1 obj1 = new Sub1();

        Sub2 obj2 = new Sub2();

        Sub3 obj3 = new Sub3();

        obj1.calculate(9);

        obj2.calculate(9);

        obj3.calculate(9);

        Console.ReadLine();

    }

}