static void Main(string[] args) { Converter converter = new Converter(28, 30); Console.WriteLine(converter.EURtoUAH(30)); Console.WriteLine(converter.UAHtoEUR(1000)); Console.WriteLine(converter.UAHtoUSD(2800)); Console.WriteLine(converter.USDtoUAH(500)); // bad tests! (throw exception for negative values) !!!! Converter badConverter = new Converter(-28, -30); Console.WriteLine(converter.USDtoUAH(-123)); }