Myprogramminglab 71018

/*
 * Lu Liu
 * 12/2/2015
 * CSCI-111-D01
 * Myprogramminglab 71018
 * Sums all the numbers in the major diagonal
 */

import java.util.Scanner;
public class DiagonalSum{
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the dimension n of an n x n matrix : ");
        int n = sc.nextInt();
        double matrix[][] = new double[n][n];
        System.out.println("\nEnter the matrix row by row ");
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix.length; j++) {
                matrix[i][j] = sc.nextDouble();
            }
        }
        double diagonalSum = sumMajorDiagonal(matrix);
        System.out.println("\nSum of the major diagonal of the matrix : " + diagonalSum);
    }
    public static double sumMajorDiagonal(double[][] m) {
        double sum = 0;
        for (int i = 0; i < m.length; i++) {
            for (int j = 0; j < m.length; j++) {
                if (i == j)
                sum += m[i][j];
            }
        }
        return sum;
    }
}