static void Main(string[] args) { Maths m1 = new Maths(); Console.WriteLine("Please enter First number:"); double firstNumber = double.Parse(Console.ReadLine()); Console.WriteLine("Please enter Second number:"); double secondNumber = double.Parse(Console.ReadLine()); Console.WriteLine("Please enter the operation to be performed on the numbers:"); switch (Console.ReadLine()) { case "Add": Console.WriteLine("The result of addition is : {0}", m1.Addition(firstNumber, secondNumber)); break; case "Sub": Console.WriteLine("The result of addition is : {0}", m1.Subtraction(firstNumber, secondNumber)); break; case "Mul": Console.WriteLine("The result of addition is : {0}", m1.Multiplication(firstNumber, secondNumber)); break; case "Div": Console.WriteLine("The result of addition is : {0}", m1.Division(firstNumber, secondNumber)); break; default: Console.WriteLine("The operation isn't implemented, Please specify other operation"); break; } }