using System;

public class Program

{

    public static void Main()

    {

        double num1 = 3;

        double num2 = 5;

        double lowNum = 0;

        string yourChoice;

        do

        {

        Console.WriteLine("Fun With Math");

        Console.WriteLine("A - Addition ");

        Console.WriteLine("S - Subtraction ");

        Console.WriteLine("M - Multiplication ");

        Console.WriteLine("Choose a Math Operation >>");

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

        switch (yourChoice)

        {

            case "A":

        Console.WriteLine(" You choose to do Addition");

        break;

            case "S":

        Console.WriteLine(" You choose to do Subtraction");

        break;

            case "M":

        Console.WriteLine(" You choose to do Multiplication");

        break;      

                 default:

                    Console.WriteLine("{0} is not a valid choice", yourChoice);

                    break;

        }

        }while (yourChoice == "A" || yourChoice == "S" || yourChoice == "M" ); 

        string decision = "";

        Console.WriteLine("Addition");

        Console.WriteLine("Subtraction");

        Console.WriteLine("Multpiplication");

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

          string startMathProblems = "";

        double mathAnswer = 0;

        DisplayWelcomeMessage();      

        startMathProblems = DoMathProblems(); 

        if (startMathProblems == "YES")

        {

            mathAnswer = Subtract(10, 20);        

            Console.WriteLine("Answer = " + mathAnswer); 

        }

         else

        {

            Console.WriteLine("We will do math later...");

        }

    }

    public static void DisplayWelcomeMessage()

    {

        Console.WriteLine("Welcome to the Math Game");

    }

    public static string DoMathProblems()

    {

        string decision = "";

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

        return decision;

    }

    public static double Subtract(double num1, double num2)

    {

        return num1 - num2;

    }

}

​

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