Vending Machine

using System;

namespace P07_Vending_Machine
{
    class Program
    {
        static void Main(string[] args)
        {
            string command = Console.ReadLine();
            double balance = 0;
            while(command != "Start")
            {
                double coin = double.Parse(command);
                if(coin==0.1 || coin==0.2 || coin==0.5 || coin==1 || coin==2)
                {
                    balance += coin;
                }
                else
                {
                    Console.WriteLine($"Cannot accept {coin}");
                }
                command = Console.ReadLine();
            }
            command = Console.ReadLine();
            while (command != "End")
            {
                double price = 0;
                switch(command)
                {
                    case "Nuts": price = 2.0;
                        break;
                    case "Water": price = 0.7;
                        break;
                    case "Crisps": price = 1.5;
                        break;
                    case "Soda": price = 0.8;
                        break;
                    case "Coke": price = 1.0;
                        break;
                    default:
                        Console.WriteLine("Invalid product");
                        break;
                }
                if(balance >= price && price > 0)
                {
                    string productToLower = command.ToLower();
                    Console.WriteLine($"Purchased {productToLower}");
                    balance -= price;
                }
                else if(price > 0)
                {
                    Console.WriteLine("Sorry, not enough money");
                }
                command = Console.ReadLine();
            }
            Console.WriteLine($"Change: {balance:f2}");
        }
    }
}