Question

In this assignment, we will show you the benefits of test driven development. You will produce two pieces of code: Squarelotron.java and SquarelotronTest.java.

This assignment deals with 2-dimensional arrays or matrices. They are not all that different from the 1-dimensional arrays that you saw in the video. Just think of them as an array of arrays.

2D arrays are usually displayed similar to a matrix.

For example to deal with the matrix below,

1 2 3

4 5 6

7 8 9

We provide the following code to help you understand 2-dimensional arrays:

int[][] myMatrix = new int[3][3]

myMatrix[0][0] = 1;

myMatrix[0][1] = 2;

myMatrix[0][2] = 3;

//you can declare an entire row

int[] secondRow = {4, 5, 6};

myMatrix[1] = secondRow;

myMatrix[2][0] = 7;

myMatrix[2][1] = 8;

myMatrix[2][2] = 9;

//if you want to print out each element on a separate line

for (int i = 0 ; i < 3; i++) {

for (int j = 0; j < 3; j++) {

System.out.println(myMatrix[i][j]);

}

}

Answer 1

CODE:-

import java.util.*;
class TDarray{
   public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
       int[][] a = new int[3][3];
       for(int i = 0;i<3;i++){
           for(int j = 0;j<3;j++){
               System.out.print("Enter a["+i+"]["+j+"]");
               a[i][j] = sc.nextInt();
           }
       }
       System.out.println("Elements in the matrix:");
       for(int i = 0;i<3;i++){
           for(int j = 0;j<3;j++){
               System.out.print(a[i][j]+" ");
           }
           System.out.println();
       }
   }
}

OUTPUT:-

NOTE:- The question is not clear...Actually you did not tell what to do...so I decided to do what is given in the question...if you have questionn just post it in the comment section...I will send answer for that..   

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