Membuat Kalkulator Console Sederhana dengan C#

Di postingan ini saya akan menjelaskan sedikit ilmu yang saya telah pelajari yaitu kalkulator konsol. Oke langsung aja ya....

Saya bakalan langsung kasih source code nya, silahkan teme-temen oprek aja lagi sendiri, oke?

int firstNum;
                int secondNum;                   //Variables for equation
                string operation;
                int answer;
                Console.WriteLine("Hello, welcome to Rena's basic calculator!");
                Console.ReadLine();
                Console.Write("Enter the first number in your basic equation: ");
                firstNum = Convert.ToInt32(Console.ReadLine());                            
                //User input for equation
                Console.Write("Now enter your second number in the basic equation: ");
                secondNum = Convert.ToInt32(Console.ReadLine());
                Console.Write("Ok now enter your operation ( x , / , +, -) ");
                operation = Console.ReadLine();
                if (operation == "x")
                {
                   answer = firstNum * secondNum;
                   Console.WriteLine(firstNum + " x " + secondNum + " = " + answer);
                   Console.ReadLine();
                }
                else if (operation == "/")
                {
                   answer = firstNum / secondNum;
                   Console.WriteLine(firstNum + " / " + secondNum + " = " + answer);
                   Console.ReadLine();
                }                                                                          
                //Getting answers
                else if (operation == "+")
                {
                   answer = firstNum + secondNum;
                   Console.WriteLine(firstNum + " + " + secondNum + " = " + answer);
                   Console.ReadLine();
                }
                else if (operation == "-")
                {
                   answer = firstNum - secondNum;
                   Console.WriteLine(firstNum + " - " + secondNum + " = " + answer);
                   Console.ReadLine();
                }
                else
                {
                   Console.WriteLine("Sorry that is not correct format! Please restart!");     //Catch
                   Console.ReadLine();
    }