Scenario
Your algorithm will keep track of a customer’s purchases at the local fireworks stand. Customers will not know exactly how many items they will purchase, so using a For loop on this lab is not allowed. Let’s keep the rules simple.

*   Accept the dollar value of each item purchased from the user until the user is finished.
*   When purchases are complete, enter a sentinel value of -1 (indicating that the user has finished).
*   If the item purchased is $50.00 or more, give your customer a 10% discount on the item purchased.
*   Display all of the purchases to the customer with the original price and the discount price.


using System;

namespace MDoyle_W5_iLab
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            int totalItems = 1;
            double items = 0;
            double itemCost = 0;
            double discountTotal = 0;

            Console.WriteLine ("Enter Item Costs Bellow. \nType '-1' to end.\n");


            while (items >= 0) {

                Console.Write ("Enter Cost of Item {0}: ", totalItems);

                while (!double.TryParse (Console.ReadLine (), out items)) {
                    Console.WriteLine ("Enter a Valid Input");
                    Console.Write ("Enter Cost of Item {0}: ", totalItems);
                }


                if (items >= 50) {
                    Console.WriteLine ("Price: ${0}", items);
                    discountTotal = (items * .10) + discountTotal;
                    items = items * .90;
                    Console.WriteLine ("After Discount: ${0}\n", items);
                    itemCost = items + itemCost;
                    totalItems++;
                }
                else if (items > 0 && items < 50)
                {
                    Console.WriteLine ("Price: ${0}\n", items);
                    itemCost = items+itemCost;
                    totalItems++;
                }
                else
                {
                    items = -1;
                }

            }

            Console.WriteLine ("\nTotal Items Sold: {0}", (totalItems - 1));
            Console.WriteLine ("Total Cost: ${0}", itemCost);

            if (discountTotal > 0) {
                Console.WriteLine ("You Saved ${0}", discountTotal);
            }
        }
    }
}