Question

Q21 Read the following code: 8 Points public class Main { public static int[][] doStuff() { int[][] array2D = new int[3][2]; for (int i = 0; i < array2D.length; i++) { for (int j = 0; j < array2D[0].length; j++) { array2D[i][j] = (i+j)%2; } } return array2D; فه public static void main(String[] args) { int[][] a = doStuff(); مہ سره Q21.1 What are the contents of array a? 6 Points Write your answer as if printing the elements row-by-row. E.g.: 1 2 3 4 5 6 7 8 9 Enter your answer here Q21.2 The array returned by method do Stuff is 3x2 (3 rows by 2 columns). What changes do you need make to method do Stuff to make the 2D array 2x5? 2 Points Assume the line array2D[i][j] = (i+j)%2; is correct and doesn't need to be changed. Enter your answer here

Answer 1

21.1

The contents of the array a are:

0 1

1 0

0 1

21.2

To changes needed in the method doStuff to make an array of 2X5 is to update the array declaration as:

int [][] array2D = new int [2][5];

The changed method will be

public static int[][] doStuff()
{
//changing the array declaration
int[][] array2D = new int[2][5];
for(int i=0; i< array2D.length; i++)
{
for(int j=0;j<array2D[0].length;j++)
{
array2D[i][j]=(i+j)%2;
}
}
return array2D;
}