/**
Finding the average of all elements in a 2D array of integers.
*/
import java.util.* ;

public class Averager2D
{
public static void main(String[] args)
{
//a 2D array
int[][] a = {{5, 9, 3, 2, 14}, {77, 44, 22, 15, 99},
          {14, 2, 3, 9, 5}, {88, 15, 17, 121, 33}} ;
System.out.printf("Average = %.2f", average(a)) ;
System.out.println("EXPECTED:") ;
System.out.println("Average = 29.85") ;
System.out.printf("Average of evens = %.2f", averageEvens(a)) ;
System.out.println("EXPECTED:") ;
System.out.println("Average of evens = 26.57") ;

Random random = new Random(1) ;
a = new int[100][1] ;
for (int i = 0 ; i < 100 ; i++)
{
a[i][0] = random.nextInt(1000) ;
}
System.out.println("For an array of random values in range 0 to 999:") ;
System.out.printf("Average = %.2f", average(a)) ;
System.out.println("EXPECTED:") ;
System.out.println("Average = 510.56") ;
System.out.printf("Average of evens = %.2f", averageEvens(a)) ;
System.out.println("EXPECTED:") ;
System.out.println("Average of evens = 557.89") ;
}
/**
Find the average of all elements of a two-dimensional array
@param aa the two-dimensional array
@return the average as a double
*/
public static double average(int[][] aa)
{
//-----------Start below here. To do: approximate lines of code = 5
// 1. declare and initialize variable total to zero; Hint: use a double

//2. use a nested for loop to visit each element ;




//3. increase total with each element ;



  //4. return the average

//-----------------End here. Please do not remove this comment. Reminder: no changes outside the todo regions.
}
/**
Find the average of the even elements of a two-dimensional array and return it
@param aa the two-dimensional array
@return the average as a double
*/
public static double averageEvens(int[][] aa)
{
//-----------Start below here. To do: approximate lines of code = 8
// fill in the method














//-----------------End here. Reminder: no changes outside the todo regions.
}
}

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