using System;

namespace application{

public class micascalculator

{

    public static void Main()

    {

while(true){

        Console.WriteLine("\n Calculator \n Enter the first number:");

        int a = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Enter second number");

        int b = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("choose operation\n 1.product\n 2.Subtract\n 3.Addition\n 4.Division");

        int c = Convert.ToInt32(Console.ReadLine());

        switch (c){

            case 1: String d= Convert.ToString(a*b);

                Console.WriteLine("Product:"+ d);

                break;

            case 2: if(a>b) Console.WriteLine("Difference:"+ Convert.ToString(a-b));

                else    Console.WriteLine("Difference:"+ Convert.ToString(b-a));

                break;

            case 3: Console.WriteLine("Sum:"+ Convert.ToString(a-b));

                break;

            case 4:Console.WriteLine("Division:"+ Convert.ToString(a/b));

                break;

            default :Console.WriteLine("Enter valid option");

                break;

        }

}

    }

}

}