using System;

public class Program

{

    public static void Main()

    {

        int a =2, b=3;

        Console.WriteLine(a.ToString("c2"));  //$2.00

        //user overrided ToString()

        Calculator cal = new Calculator();

        Console.WriteLine(cal.ToString());  //THe sum is 0

    }

}

public class Calculator{    

    //properties

    public int FirstInput{get;set;}

    public int SecondInput{get; set;}

    public int Sum(int firstInput, int secondInput){

        int sum = firstInput + secondInput;

        return sum;

    }

    public override string ToString(){

        return ("THe sum is " + (FirstInput + SecondInput));

    }

}