using System;

​

namespace SimpleVendingMachine

{

    public struct Product

    {

        public string Name;

        public double Price;

        public int Stock;

    }

​

    public class Program

    {

        static Product[] machine = new Product[10];

​

        public static void Main(string[] args)

        {

            LoadItems();

            RunVendingMachine();

        }

​

        static void LoadItems()

        {

            machine[0] = new Product { Name = "Twix", Price = 1.50, Stock = 5 };

            machine[1] = new Product { Name = "Crisps", Price = 0.80, Stock = 5 };

            machine[2] = new Product { Name = "Soda", Price = 1.20, Stock = 5 };

            machine[3] = new Product { Name = "Chocolate Bar", Price = 1.00, Stock = 5 };

            machine[4] = new Product { Name = "Gum", Price = 0.50, Stock = 5 };

            machine[5] = new Product { Name = "Juice", Price = 1.50, Stock = 5 };

            machine[6] = new Product { Name = "Candy", Price = 0.60, Stock = 5 };

            machine[7] = new Product { Name = "Water", Price = 0.90, Stock = 5 };

            machine[8] = new Product { Name = "Granola Bar", Price = 1.10, Stock = 5 };

            machine[9] = new Product { Name = "Chips", Price = 1.30, Stock = 5 };

        }

​

        static void RunVendingMachine()

        {

            double totalMoney = 0;

            bool running = true;

​

            while (running)

            {

                Displayproducts();

                Console.WriteLine("1) Insert Coins \n2) Select Product \n3) Exit");

                string choice = Console.ReadLine();

​

                if (choice == "1")

                {

                    totalMoney += InsertCoins();

                }

                else if (choice == "2")

                {

                    totalMoney = SelectProduct(totalMoney);

                }

                else if (choice == "3")

                {

                    running = false;

                    Console.WriteLine("Thank you for using the vending machine!");

                }

                else

                {

                    Console.WriteLine("Invalid selection. Try again.");

                }

            }

        }

​

        static void Displayproducts()

        {

            Console.WriteLine("Available Products:");

            for (int i = 0; i < machine.Length; i++)

            {

                if (machine[i].Stock > 0)

                {

                    Console.WriteLine(i + ") " + machine[i].Name + " - £" + machine[i].Price + " (Stock: " + machine[i].Stock + ")");

                }

                else

                {

                    Console.WriteLine(i + ") " + machine[i].Name + " - Out of stock");

                }

            }

        }

​

        static double InsertCoins()

        {

            double totalInserted = 0;

​

            while (true)

            {

                Console.WriteLine("Insert a coin: \n1) 5p \n2) 10p \n3) 20p \n4) 50p \n5) £1 \n6) £2 \nX) Quit");

                string input = Console.ReadLine();

​

                if (input.ToUpper() == "X") break;

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                double coinValue = 0;

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                if (input == "1") coinValue = 0.05;

                else if (input == "2") coinValue = 0.10;

                else if (input == "3") coinValue = 0.20;

                else if (input == "4") coinValue = 0.50;

                else if (input == "5") coinValue = 1.00;

                else if (input == "6") coinValue = 2.00;

                else

                {

                    Console.WriteLine("Invalid coin. Please try again.");

                    continue;

                }

​

                totalInserted += coinValue;

                Console.WriteLine("Total Money Inserted: £" + totalInserted.ToString("F2"));

            }

​

            return totalInserted;

        }

​

        static double SelectProduct(double totalmoney)

        {

            Console.WriteLine("Enter product code:");

            int productCode;

            if (int.TryParse(Console.ReadLine(), out productCode) && productCode >= 0 && productCode < machine.Length)

            {

                if (machine[productCode].Stock > 0)

                {

                    if (totalmoney >= machine[productCode].Price)

                    {

                        totalmoney -= machine[productCode].Price;

                        machine[productCode].Stock--; // Update stock

                        Console.WriteLine("Dispensed " + machine[productCode].Name + ". Remaining balance: £" + totalmoney.ToString("F2"));

                    }

                    else

                    {

                        Console.WriteLine("Insufficient funds. Please insert more coins.");

                    }

                }

                else

                {

                    Console.WriteLine("Sorry, this product is out of stock.");

                }

            }

            else

            {

                Console.WriteLine("Invalid product code. Please try again.");

            }

​

            return totalmoney;

        }

    }

}

​