static void Main(string[] args) { NormalCalculator n1 = new NormalCalculator(); n1.sum(10, 20); n1.sub(40, 20); n1.multiplication(15, 10); n1.division(100, 20); Console.WriteLine(); ScientificCalculator s1 = new ScientificCalculator(); s1.XtoY(5, 10); s1.SquareRoot(8); }