Question

Given a two-dimensional array of integers named q, with 2 rows and 4 columns, write some code that puts a zero in every element of q. Declare any variables needed to help you.

Answer 1

By choosing a programming language such as Java, the codes that puts a zero in every element of the two-dimensional array, q can be as follows:

1. public class HelloWorld{
3. public static void main(String []args){
5. int q[][] = new int[2][4];
7. for(int i = 0; i < 2; i++)
8. {
9. for(int j = 0; j < 4; j++)
10. {
11. q[i][j] = 0;
12. }
13. }
14. }
15. }

Step-by-step explanation:

• Line 5 - Declare a variable q and specify two indices 2 and 4 within the square brackets. This will create an array with a size of 2 rows and 4 columns.

• Line 7 - Write an outer for-loop that iterate through the rows

• Line 9 - Write an inner for-loop that iterate through the columns

• Line 11 - Assign zero to the element of q at a specific index, i (current row number) and j (current column number). This line of code will run repeatedly and assign zero to q[0][0], q[0][1], q[0][2] .... q[1][0], q[1][1]....,q[1][3]

We can also verify our result by adding some codes (Lines 15 - 21) to print every element of q and check if all of the elements are set to zero:

1. public class HelloWorld{
3. public static void main(String []args){
5. int q[][] = new int[2][4];
7. for(int i = 0; i < 2; i++)
8. {
9. for(int j = 0; j < 4; j++)
10. {
11. q[i][j] = 0;
12. }
13. }
15. for(int i = 0; i < 2; i++)
16. {
17. for(int j = 0; j < 4; j++)
18. {
19. System.out.println(q[i][j]);
20. }
21. }
22. }
23. }

We will see the Line 19 will print out zero for each element of q.