求矩阵主对角线元素的和 Exercise08_02

import java.util.Scanner;
/**
 * @author 冰樱梦
 * 时间：2018年12月
 * 题目：求矩阵主对角线元素的和
 *
 */
public class Exercise08_02 {
    public static void main(String[] args){
        Scanner input=new Scanner(System.in);
        System.out.println("Enter the arrays row: ");
        int row=input.nextInt();
        System.out.println("Enter the arrays column: ");
        int col=input.nextInt();
        double[][] list=new double[row][col];
        for(int i=0;i<list.length;i++){
            for(int j=0;j<list[i].length;j++){
                list[i][j]=input.nextDouble();
            }
        }
        System.out.println("Sum of the elements in the major diagonal is "+sumMajorDiagonal(list));
    }
    
    
    
    /**
     * @param m
     * @return
     * 返回主对角线的和
     */
    public static double sumMajorDiagonal(double [][] m){
        double total=0;
        for(int i=0;i<m.length;i++){
            total+=m[i][i];
        }
        return total;
    }
}