using System;

public class Program

{

    public static void Main()

    {

        ShoppingCart sc = new ShoppingCart();

        sc.FillCart();

    }

}

​

public class ShoppingCart

{

    public void FillCart()

    {

        double amount = 0;

        int product = 1;

        int total = 0;

        bool fill = true;

        while(fill)

        {

            if (total == 0)

            {

                Console.WriteLine("What product would you like? Enter 0 to exit. (0|1|2|3) ");

                product = Convert.ToInt32(Console.ReadLine());

                if (product != 0)

                {

                    Console.WriteLine("How many would you like?");

                    total = Convert.ToInt32(Console.ReadLine());

                }

            }

            if (product == 0)

            {

                fill = false;

                break;

            }

            switch(product)

            {

            case 1:

                amount += 2.98;

                break;

            case 2:

                amount += 4.50;

                break;

            case 3:

                amount += 9.98;

                break;

            default:

                Console.WriteLine("Product ID Invalid!!");

                total = 1;

                break;

            }

            total--;

        }

        Console.WriteLine("Your total is: {0}",amount);

    }

}