static void Main(string[] args)
		{
			Console.WriteLine(" Conversion options");
			Console.WriteLine("-------------------");
			Console.WriteLine("(C)Celsius");
			Console.WriteLine("(F)Fahrenheit");
			Console.WriteLine("(X)Exit");
			Console.WriteLine("Your Choice?\n");

			char Menu;
			Menu = Convert.ToChar(Console.ReadLine());

			double n, c;

			if (Menu == 'C' || Menu == 'c')
            {
				Console.Write("Input Value (celsius)  : ");
				n = Convert.ToDouble(Console.ReadLine());
				c = (n * 9/5) + 32;
				Console.WriteLine("{0} Celsius : {1} Fahrenheit", n, c);
				Console.ReadKey();
			}
			else if (Menu == 'F' || Menu == 'f')
            {
				Console.Write("Input Value (Fahrenheit)  : ");
				n = Convert.ToDouble(Console.ReadLine());
				c = (n - 32) * 5/9;
				Console.WriteLine("{0} Fahrenheit : {1} Celsius", n, c);
				Console.ReadKey();
			}

			else if (Menu == 'X' || Menu == 'x')
			{
				Console.Write("Goodbye!");
				Environment.Exit(0);
			}
			Console.ReadKey(true);
		}