using System;

public class Program

{

    public static double[] arrayAvg(double[, ] a)

    {

        double[] tempArray = new double[a.GetLength(0)];

        double sum = 0;

        for (int i = 0; i < a.GetLength(0); i++)

        {

            for (int j = 0; j < a.GetLength(1); j++)

            {

                sum = sum + a[i, j];

            }

​

            double avg = sum / (a.GetLength(1));

            tempArray[i] = avg;

            sum = 0;

        }

​

        return tempArray;

    }

​

    public static void Main()

    {

        Console.WriteLine("How many students are in your class?");

        int s1 = int.Parse(Console.ReadLine());

        string[] studentnames = new string[s1];

        Console.WriteLine("What are the names of your students?");

        for (int i = 0; i < s1; i++)

            studentnames[i] = Console.ReadLine();

        Array.Sort(studentnames);

        Console.WriteLine("How many grades does each student have?");

        int s2 = int.Parse(Console.ReadLine());

        double[, ] grades = new double[s1, s2];

        for (int i = 0; i < s1; i++)

        {

            Console.WriteLine("What are the grades for " + studentnames[i]  + "?");

            for (int j = 0; j < s2; j++)

                grades[i, j] = double.Parse(Console.ReadLine());

            Console.Clear();

        }

        Console.Clear();

        Console.WriteLine("These are the grades of your students:");

        double[] average = arrayAvg(grades);

        for (int i = 0; i < s1; i++)

        {

            Console.WriteLine(studentnames[i] + ":");

            for(int j = 0; j < s1; j++)

            Console.Write(grades[i, j] + "| ");

            Console.Write(" Final Average:" + average[i]);

            Console.WriteLine("\n______________________________________________");

        }         

        Console.WriteLine("The following students failed:");

        for(int i = 0; i < average.Length; i++)

        {

            if(average[i] < 65)

                Console.WriteLine(studentnames[i]);

        }

        Console.WriteLine("\nThe following students passed:");

        for(int i = 0; i < average.Length; i++)

        {

            if(average[i] > 65)

                Console.WriteLine(studentnames[i]);

        }

    }

}

​