*8.2 (Sum the major diagonal in a matrix) Write a method that sums all the numbers in the major diagonal in an n * n matrix of double values using the following header: public static double sumMajorDiagonal(double[][] m) Write a test program that reads a 4-by-4 matrix and displays the sum of all its elements on the major diagonal. Here is a sample run: Enter a 4-by-4 matrix row by row: 1 2 3 4.0 5 6.5 7 8 9 10 11 12 13 14 15 16 Sum of the elements in the major diagonal is 34.5
import java.util.Scanner; public class ProgramingEx8_2 { public static void main(String[] args) { double[][] matrix = new double[4][4]; java.util.Scanner input = new Scanner(System.in); System.out.println("Enter a 4-by-4 matrix row by row: "); for (int row = 0; row < matrix.length; row++) { for (int column = 0; column < matrix[row].length; column++) { matrix[row][column] = input.nextDouble(); } } System.out.println("Sum of the elements in the major diagonal is " + sumMajorDiagonal(matrix)); } public static double sumMajorDiagonal(double[][] m) { double sum = 0; for (int row = 0; row < m.length; row++) { sum += m[row][row]; } return sum; } }
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