using System;

​

public class Program

{

    public static void Main()

    {

        string command = "-";

        switch (command)

        {

            case "+":

                Console.WriteLine("Adding...");

                break;

            case "-":

                Console.WriteLine("Subtracting...");

                // do_something_here();

                break;

            case "*":

                Console.WriteLine("Multiplying...");

                break;

            default:

                Console.WriteLine("Invalid Command");

                break;

        }

    }

}