تحديات برمجيةالتحدي الثاني - حل التمرين الخامس بلغة C#

using System;

class Program
{
    static void Main(string[] args)
    {
        double a, b;
        int option = -1;

        Console.Write("Enter first number: ");
        a = Double.Parse(Console.ReadLine());

        Console.Write("Enter second number: ");
        b = Double.Parse(Console.ReadLine());

        Console.WriteLine(
                "\nWrite down the operation number then press enter\n"
                + "0: To end the program.\n"
                + "1: To print the sum.\n"
                + "2: To print the subtraction.\n"
                + "3: To print the multiplication.\n"
                + "4: To print the division.");

        while (option != 0)
        {
            Console.WriteLine("-------------------------");
            Console.Write("Enter option: ");
            option = Int32.Parse(Console.ReadLine());

            switch (option)
            {
                case 0:
                    Console.WriteLine("Program end.");
                    break;
                case 1:
                    Console.WriteLine(a + " + " + b + " = " + (a + b));
                    break;
                case 2:
                    Console.WriteLine(a + " - " + b + " = " + (a - b));
                    break;
                case 3:
                    Console.WriteLine(a + " * " + b + " = " + (a * b));
                    break;
                case 4:
                    Console.WriteLine(a + " / " + b + " = " + (a / b));
                    break;
            }
        }

        Console.ReadKey();
    }
}