求矩阵主对角线元素的和 Exercise08

求矩阵主对角线元素的和 Exercise08_02

 1 import java.util.Scanner;
 2 /**
 3  * @author 冰樱梦
 4  * 时间：2018年12月
 5  * 题目：求矩阵主对角线元素的和
 6  *
 7  */
 8 public class Exercise08_02 {
 9     public static void main(String[] args){
10         Scanner input=new Scanner(System.in);
11         System.out.println("Enter the arrays row: ");
12         int row=input.nextInt();
13         System.out.println("Enter the arrays column: ");
14         int col=input.nextInt();
15         double[][] list=new double[row][col];
16         for(int i=0;i<list.length;i++){
17             for(int j=0;j<list[i].length;j++){
18                 list[i][j]=input.nextDouble();
19             }
20         }
21         System.out.println("Sum of the elements in the major diagonal is "+sumMajorDiagonal(list));
22     }
23     
24     
25     
26     /**
27      * @param m
28      * @return
29      * 返回主对角线的和
30      */
31     public static double sumMajorDiagonal(double [][] m){
32         double total=0;
33         for(int i=0;i<m.length;i++){
34             total+=m[i][i];
35         }
36         return total;
37     }
38 }