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Solution Review: Print a Matrix

Understand how to initialize a matrix in Java using nested loops by assigning zeros to diagonal elements, minus ones to lower diagonal elements, and ones to upper diagonal elements. Learn to print the matrix clearly, which helps reinforce foundational array operations and nested looping concepts.

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Solution

Java
class TwoDimArr {

    public static void main( String args[] ) {

       int n = 3; 

       int[][] arr = new int[n][n];

        for (int i = 0; i < arr.length; i++) { //assign values to the arr

            for (int j = 0; j < arr.length; j++) {

                if (i == j) { //if row=column=> fill the matrix with 0

                    arr[i][j] = 0;

                } else if (i > j) { //if row>columns=> fill matrix with -1

                    arr[i][j] = -1;

                } else { //if row<columns=> fill matrix with 1

                    arr[i][j] = 1;

                }

            }

        }

        for (int i = 0; i < arr.length; i++) { //print the array

            for (int j = 0; j < arr.length; j++) {

                System.out.print(arr[i][j] + " ");

            }

            System.out.println();

        }

    }

}

How

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