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;
     }
 }