using System;

using System.Linq;

public class Program

{

        public static void Main()

        {   start:

            Console.Clear();

            Console.WriteLine("How many grades would you like to enter?");

            int num = int.Parse(Console.ReadLine());

            Console.Clear();

            Console.WriteLine("Thank you for your input. Please enter your " + num + " grades, pressing enter after each.");

            float []grades;

            grades = new float[num];

            for (int i = 0; i <num; i++)

            { grades[i] = float.Parse(Console.ReadLine()); }

            Console.Clear();

            Array.Sort(grades);

            Console.Write("Your grades from smallest to largest are: ");

            for (int i = 0; i < num; i++)

            { Console.Write(grades[i]);  }

            Console.WriteLine();

            float avg = grades.Average();

            Console.WriteLine("The average of your grades is: " + avg);

            if (avg <65)

            { Console.WriteLine("You have failed"); }

            else if (avg >= 65)

            { Console.WriteLine("You have passed"); }

            fix:

            Console.WriteLine("Would you like to calculate another average? (y/n)");

            string again = Console.ReadLine();

            if (again == "Y" || again == "y")

                goto start;

            else if (again == "N" || again == "n")

               {Console.WriteLine("Goodbye");}

            else

            {

                Console.WriteLine("Please Enter Either y or n.");

                goto fix;

            }

        }

   }

​