sumMajorDiagonal.java

import java.util.Scanner;
public class SumMajorDiagonalMatrix {
    public static double sumMajorDiagonal (double [][] m){
        double sum = 0;
        for (int i =0;i < m.length;i++){
            sum = sum + m[i][i];
        }
        return sum;
    }
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("请输入矩阵的行和列： ");
        int row = input.nextInt();
        int column = input.nextInt();
        double[][] matrix = new double[row][column];
        System.out.println("请输入矩阵： ");
        for (int i = 0;i < matrix.length;i++){
            for (int j = 0;j < matrix[i].length;j++){
                matrix[i][j] = input.nextDouble();
            }
        }
        System.out.println("Sum of elements in the major diagonal is " + sumMajorDiagonal(matrix));
    }

}