using System;

public class Program

{

    public static void DisplayWelcomMessage()

    {

        Double num1 = 0;

        Double num2 = 0;

        string MenuChoice = " ";

         double lowNum = 0;

        Double InputNumber;

        string myChoice = " ";

        double mathAnswer = 0;

        Console.WriteLine(" Fun With Math");

        Console.WriteLine("MenuChoice: ");

        Console.WriteLine("Add - Addition Opperation");

        Console.WriteLine("Sub - Subtraction Opperation"); 

        Console.WriteLine("Mult - Multipication Opperation");

        Console.WriteLine("Q - Quit\n");  

        Console.WriteLine("Choice (Add,Sub,Mult, or Q: ");

        MenuChoice = Console.ReadLine().ToUpper();

        Console.WriteLine("Input number 1:");

        InputNumber = double.Parse(Console.ReadLine());

        Console.WriteLine("Input number 2:");

        InputNumber = double.Parse(Console.ReadLine());

         switch(myChoice.ToUpper())

         {

                case "Addition":

​

                case "add":

​

                    Console.WriteLine("You wish to do addition.");

​

                    break;

                case "Subtraction":

​

               case "sub":

​

                    Console.WriteLine("You wish to do subtraction.");

​

                    break;

                 case "Division":

​

                case "mult":

​

                    Console.WriteLine("You wish to do division.");

​

                    break;

                 case "Q":

​

                case "q":

​

                    Console.WriteLine("Bye.");

​

                    break;

         }

         if(MenuChoice == "Add")

         {

         public static void Subtract(double num1, double num2)

    }

}}