Example: Display Upper Triangular Form in Java

// Display Upper Triangular Form
public class Main {
    public static void main(String[] args) {
        // Step 1: Define a sample matrix
        int[][] matrix = {
            {1, 2, 3},
            {4, 5, 6},
            {7, 8, 9}
        };

        // Step 2: Print the original matrix for comparison
        System.out.println("Original Matrix:");
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[0].length; j++) {
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }

        // Step 3: Check if the matrix is square
        boolean isSquare = true;
        if (matrix.length == 0 || matrix[0].length == 0 || matrix.length != matrix[0].length) {
            isSquare = false;
        }

        // Step 4: Display the upper triangular form
        System.out.println("\nUpper Triangular Form:");
        if (!isSquare) {
            System.out.println("Matrix is not a square matrix.");
        } else {
            for (int i = 0; i < matrix.length; i++) {
                for (int j = 0; j < matrix[0].length; j++) {
                    if (j < i) { // Elements below the main diagonal (j < i or i > j)
                        System.out.print("0 ");
                    } else {
                        System.out.print(matrix[i][j] + " ");
                    }
                }
                System.out.println();
            }
        }
    }
}