using System;

public class Program

{

    public static double[] arrayAvg(double[, ] a) //2D array input

    {

        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("Please enter the amount of students you have.");

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

        string[] names = new string[students];

        Console.WriteLine("Please enter each student's name individually, by pressing enter after each one.");

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

        {

            names[i] = Console.ReadLine();

            Console.Clear();

        }

        Array.Sort(names);

        Console.WriteLine("How many grades are there for each student?");

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

        double [,] grades = new double[students,gradeAmount];

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

        {

            Console.WriteLine("Please enter the grades for "+i);

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

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

        }

    }

}