using System;

using System.Collections.Generic;

​

class Program

{

    static void Main()

    {

        List<Dictionary<string, object>> products = new List<Dictionary<string, object>>

        {

            new Dictionary<string, object> {{"item", "1"}, {"name", "Coca Cola"}, {"price", 1.50}, {"stock", 3}},

            new Dictionary<string, object> {{"item", "2"}, {"name", "Chips"}, {"price", 1.00}, {"stock", 0}},

            new Dictionary<string, object> {{"item", "3"}, {"name", "Chocolate Milk"}, {"price", 0.75}, {"stock", 5}},

            new Dictionary<string, object> {{"item", "4"}, {"name", "Water"}, {"price", 1.25}, {"stock", 10}},

            new Dictionary<string, object> {{"item", "5"}, {"name", "Pepsi"}, {"price", 1.75}, {"stock", 15}},

            new Dictionary<string, object> {{"item", "6"}, {"name", "Pie"}, {"price", 1.50}, {"stock", 2}},

            new Dictionary<string, object> {{"item", "7"}, {"name", "Sausage Roll"}, {"price", 2.00}, {"stock", 4}},

            new Dictionary<string, object> {{"item", "8"}, {"name", "Juice"}, {"price", 0.50}, {"stock", 11}}

        };

​

        double balance = 0.0;

​

        Console.WriteLine("Products:");

        Console.WriteLine("-------------------");

        foreach (var item in products)

        {

            Console.WriteLine($"{item["item"]}: {item["name"]} - ${item["price"]:0.00} (Stock: {item["stock"]})");

        }

​

        Console.Write("Enter the currency amount: ");

        double amount = double.Parse(Console.ReadLine());

        balance += amount;

​

        Console.Write("Enter the product number: ");

        string code = Console.ReadLine();

        bool productFound = false;

​

        foreach (var item in products)

        {

            if (item["item"].ToString() == code)

            {

                productFound = true;

                if ((int)item["stock"] > 0 && balance >= (double)item["price"])

                {

                    item["stock"] = (int)item["stock"] - 1;

                    balance -= (double)item["price"];

                    Console.WriteLine($"You have purchased {item["name"]}");

                    Console.WriteLine($"Remaining balance: ${balance:0.00}");

                }

                else if ((int)item["stock"] == 0)

                {

                    Console.WriteLine("Product out of stock.");

                }

                else

                {

                    Console.WriteLine("Insufficient balance.");

                }

                break;

            }

        }

​

        if (!productFound)

        {

            Console.WriteLine("Not a product.");

        }

​

        Console.WriteLine($"Returned change: ${balance:0.00}");

    }

}

​