static void Main(string[] args) { double a = EnterNumber1(); char operation = EnterOperator(); double b = EnterNumber2(); Calculations calc = new Calculations(); switch (operation) { case '+': PrdoubleResult(calc.Sum(a, b).ToString()); break; case '-': PrdoubleResult(calc.Diff(a, b).ToString()); break; case '*': PrdoubleResult(calc.Multiply(a, b).ToString()); break; case '/': try { PrdoubleResult(calc.Division(a, b).ToString()); } catch (DivideByZeroException) { Console.WriteLine("Divide by zero"); } break; case '%': PrdoubleResult(calc.Mod(a, b).ToString()); break; } Console.ReadKey(); }