ДЗ: Конвертер валют

gistfile1.txt

namespace Task
{
    internal class Program
    {
        static void Main()
        {

            const string UsdToRubCommand = "usdToRub";
            const string RubToUsdCommand = "rubToUsd";
            const string EuroToRubCommand = "euroToRub";
            const string RubToEuroCommand = "rubToEuro";
            const string EuroToUsdCommand = "euroToUsd";
            const string UsdToEuroCommand = "usdToEuro";
            const string ShowBalanceCommand = "showBalance";
            const string ExitCommand = "exit";

            double usdToRubRate = 79;
            double rubToUsdRate = 1 / usdToRubRate;

            double euroToRubRate = 90;
            double rubToEuroRate = 1 / euroToRubRate;

            double euroToUsdRate = 1.14;
            double usdToEuroRate = 1 / euroToUsdRate;

            double rubBalance = 1500;
            double usdBalance = 900;
            double euroBalance = 500;

            double moneyAmount;

            string textMenu = "МЕНЮ\n" +
                $"{UsdToRubCommand} - Доллары в рубли\n" +
                $"{RubToUsdCommand} - Рубли в доллары\n" +
                $"{EuroToRubCommand} - Евро в рубли\n" +
                $"{RubToEuroCommand} - Рубли в евро\n" +
                $"{EuroToUsdCommand} - Евро в доллары\n" +
                $"{UsdToEuroCommand} - Доллары в евро\n" +
                $"{ShowBalanceCommand} - Показать баланс\n" +
                $"{ExitCommand} - Выход";

            bool isWork = true;

            string command;

            Console.WriteLine(textMenu);

            while (isWork)
            {
                Console.Write("Команда: ");
                command = Console.ReadLine();

                switch (command)
                {
                    case UsdToRubCommand:
                        Console.Write("Объем конвертации: ");
                        moneyAmount = Convert.ToDouble(Console.ReadLine());

                        if (usdBalance >= moneyAmount && moneyAmount > 0)
                        {
                            usdBalance -= moneyAmount;
                            rubBalance += moneyAmount * usdToRubRate;
                        }

                        break;

                    case RubToUsdCommand:
                        Console.Write("Объем конвертации: ");
                        moneyAmount = Convert.ToDouble(Console.ReadLine());

                        if (rubBalance >= moneyAmount && moneyAmount > 0)
                        {
                            rubBalance -= moneyAmount;
                            usdBalance += moneyAmount * rubToUsdRate;
                        }

                        break;

                    case EuroToRubCommand:
                        Console.Write("Объем конвертации: ");
                        moneyAmount = Convert.ToDouble(Console.ReadLine());

                        if (euroBalance >= moneyAmount && moneyAmount > 0)
                        {
                            euroBalance -= moneyAmount;
                            rubBalance += moneyAmount * euroToRubRate;
                        }

                        break;

                    case RubToEuroCommand:
                        Console.Write("Объем конвертации: ");
                        moneyAmount = Convert.ToDouble(Console.ReadLine());

                        if (rubBalance >= moneyAmount && moneyAmount > 0)
                        {
                            rubBalance -= moneyAmount;
                            euroBalance += moneyAmount * rubToEuroRate;
                        }

                        break;

                    case EuroToUsdCommand:
                        Console.Write("Объем конвертации: ");
                        moneyAmount = Convert.ToDouble(Console.ReadLine());

                        if (euroBalance >= moneyAmount && moneyAmount > 0)
                        {
                            euroBalance -= moneyAmount;
                            usdBalance += moneyAmount * euroToUsdRate;
                        }

                        break;

                    case UsdToEuroCommand:
                        Console.Write("Объем конвертации: ");
                        moneyAmount = Convert.ToDouble(Console.ReadLine());

                        if (usdBalance >= moneyAmount && moneyAmount > 0)
                        {
                            usdBalance -= moneyAmount;
                            euroBalance += moneyAmount * usdToEuroRate;
                        }

                        break;

                    case ShowBalanceCommand:
                        Console.WriteLine($"Рубли: {rubBalance}, " +
                            $"доллары: {usdBalance}, " +
                            $"евро: {euroBalance}");
                        break;

                    case ExitCommand:
                        isWork = false;
                        break;

                    default:
                        Console.WriteLine("Такой команды нет.");
                        break;
                }
            }
            
            Console.WriteLine("Пограмма закрыта.");
        }
    }
}