public static void Main()
Console.WriteLine("Type Number 1 :");
num1 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Type Number 2 :");
num2 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Choose Your Symbol + - / * %");
sym = Console.ReadLine();
Console.WriteLine("Please choose a valid symbol");
Console.WriteLine("correct answer is {0}" , ans);