using System;
using System.Collections;
using System.Linq;
using System.Text;

namespace csharp
{

    class chapter2
    {
        static void Main(string[] args)
        {
            int[,] grades = new int[,] {{1, 82, 74, 89, 100},
                                        {2, 93, 96, 85, 86},
                                        {3, 83, 72, 95, 89},
                                        {4, 91, 98, 79, 88}};
            int last_grade = grades.GetUpperBound(1);
            double average = 0.0;
            int total;
            int last_student = grades.GetUpperBound(0);
            for (int row = 0; row <= last_student; row++)
            {
                total = 0;
                for (int col = 0; col <= last_grade; col++)
                {
                    total += grades[row,col];
                }
                    average = total / last_grade;
                    Console.WriteLine("Average: " + average);
         
            }
            Console.ReadKey();
        }
    }
}