using System;

public class Program

{

    public static void Main()

    {

         איתחול דו מימדי - מבנה:

        int rows = 3;

        int cols = 3;

        int[,] mat = new int[rows, cols];

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

        {

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

             {

                 mat[i,j] = 0;

             }

        }

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

        {

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

             {

                 Console.Write(mat[i,j]);

             }

             Console.WriteLine( );

        }

        חד מימדי:

        Console.WriteLine("enter num of stud");

        int students;

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

        int[] grades = new int[students];

        int sum = 0;

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

        {

            Console.WriteLine("enter the grade");

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

            sum += grades[i];

        }

        int count = 0;

        double avg;

        avg = sum/students;

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

        {

        if(grades[i] > avg)

            count++;

        }

        Console.WriteLine("avg: " + avg);

        Console.WriteLine("students in: " + count);

    }

}