private void FeedMoney() { int input; string choice = ""; decimal total = vendingMachine.customerBalance; while (choice.ToUpper() != "B") { Console.WriteLine(); Console.WriteLine("Current Balance: $" + total); Console.WriteLine("Insert Bill: ($1, $2, $5, $10) "); Console.WriteLine("Press B to return to Purchase Menu"); Console.Write("Choice: "); choice = Console.ReadLine(); if (choice.ToUpper() == "B") { choice = choice.ToUpper(); } else { input = int.Parse(choice); if (input == 1 || input == 2 || input == 5 || input == 10) { total += input; vendingMachine.AuditTransaction(input, total); } else { Console.WriteLine("Invalid Bill Type"); } } } vendingMachine.customerBalance = total; }