static void Main(string[] args)
        {
            double fahr = 100;
            int contador = 0;
            do
            {
                contador++;
                Console.WriteLine("{0} graus Fahrenheit equivale a {1} graus Celcius", fahr, Conversor(fahr).ToString("#.00"));
                fahr--;

                if (contador == 10)
                {
                    Console.WriteLine("\n");
                    contador = 0;
                }

            } while (fahr != -11);
            Console.ReadKey();
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="f"></param>
        /// <returns></returns>
        public static double Conversor(double f)
        {
            double cel = 0;
            cel = 5.0 / 9.0 * (f - 32.0);
            return cel;
        }