Question

Which of the following can print out all elements in array? int[] [] items = { {0, 1, 3, 4}, {4, 3, 99, 0, 7 }, {3, 2} }; for (int row=0; row < items.length; rowt) O { System.out.println(); for (int col=0; col < items.length; col++) System.out.print( items[row][col] + " "); } for (int row=0; row < items.length; row++) { System.out.println(); for (int col=0; col < items(col).length; col++) System.out.print( items[row][col] + " "); for (int row=0; row < items.length; row++) } { for (int row=0; row < items[row).length; row++) System.out.print( items[row][col] + " "); System.out.println(); } for (int row=0; row < items.length; row++) System.out.println(); for (int col=0; col < items[row).length; col++) System.out.print( items[row][col] + " ");

Answer 1

[Ans] 4th option

for(int row = 0; row < items.length; row++)
{
    System.out.println();
    for(int col=0; col < items[row].length; col++)
        System.out.print(items[row][col]+" ");
}

Execution Results:

1 Sjavac Main.java 3 $java-Xmx128M-Xms16M Main { 0134 43 99 07 32 public class Main 2. { public static void main(String []args) 4- 5 int[][] items = { {0, 1, 3, 4}, 6 {4, 3, 99, 0, 7}, 7 {3, 2} }; 8 for(int row = 0; row< items.length; row++) 9. 10 System.out.println(); 11 for(int col=0; col < items[row).length; col++) 12 System.out.print(items[row][col]+" "); 13 14 15 } سها } metben

This code is correct, row correctly represent the array index and col correctly represent the index of element in the row index array. And the condition to terminate the inner for loop is correct. Inner loop takes a row th array and prints all of its elements side by side. While the outer loop changes row index from 0 to items.length - 1 and change the reference from one array to the next. Thus all the elements of all arrays are printed as in the above image.

Reasons for why options a, b, c are wrong:

Option a: Inner loop terminating condition is wrong which is set to the items.lenght but has to be items[row].length

Option b: Inner loop terminating condition is wrong which is set to the items[col].lenght but has to be items[row].length

Option c: It is completely wrong in the inner loop iterating variable is declared as int row instead of int col but used properly in the next printing line.

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