private static void ConvertTo(CurrencyConverter currencyConverter) { Console.WriteLine("Choose option:"); Console.WriteLine("1: Convert from USD"); Console.WriteLine("2: Convert from EUR"); Console.WriteLine("3: Convert from RUB"); var option = int.Parse(Console.ReadLine()); Console.WriteLine("Enter amount"); var input = double.Parse(Console.ReadLine()); switch (option) { case 1: Console.WriteLine(currencyConverter.ConvertFromUsd(input)); break; case 2: Console.WriteLine(currencyConverter.ConvertFromEur(input)); break; case 3: Console.WriteLine(currencyConverter.ConvertFromRub(input)); break; } }