Do_While_Loop_Ex_3 (Wk-7) Feb 17-21, 2014

Ex 3: Request 5 grads from user, then compute average grade.
        static void Main(string[] args)
        {
            float S = 0;
            int counter = 1;
            do
            {
                int grade;
                do
                {
                    Console.Write("Enter grade 0 to 100 : ");
                    grade = int.Parse(Console.ReadLine());
                } while (grade < 0 || grade > 100);

                S += grade;
                counter++;
            } while (counter <= 5);
            float avg = S / 5;
            Console.WriteLine("\nThe average grade is {0:f1}", avg);
            Console.ReadLine();
        }