C# Funadamentals - 01. ComputerStore - MidExam 12.08.2020

using System;

namespace ConsoleApp1
{
    class ComputerStore
    {
        static void Main(string[] args)
        {
            double totalPrice = 0.00;
            double tax = 0.00;
            string command = Console.ReadLine();
            while (true)
            {
                if (command == "special" || command == "regular")
                {
                    break;
                }
                double price = double.Parse(command);
                if (price < 0)
                {
                    Console.WriteLine("Invalid price!");
                    command = Console.ReadLine();
                    continue;
                }

                else
                {
                    totalPrice += price;
                    tax += (price * 0.20);
                }

                command = Console.ReadLine();
            }

            if (totalPrice == 0)
            {
                Console.WriteLine("Invalid order!");
                return;
            }
            double printPrice = totalPrice;

            if (command == "special")
            {
                totalPrice = (totalPrice + tax) * 0.90;
            }
            else
            {
                totalPrice += tax;
            }

            Console.WriteLine("Congratulations you've just bought a new computer!");
            Console.WriteLine($"Price without taxes: {printPrice:f2}$");
            Console.WriteLine($"Taxes: {tax:f2}$");
            Console.WriteLine("-----------");
            Console.WriteLine($"Total price: {totalPrice:f2}$");
        }
    }
}