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  • 求矩阵中各列数字的和 Exercise08_01

     1 import java.util.Scanner;
     2 /**
     3  * @author 冰樱梦
     4  * 时间:2018年12月
     5  * 题目:求矩阵中各列数字的和
     6  *
     7  */
     8 public class Exercise08_01 {
     9     public static void main(String[] args){
    10         Scanner input=new Scanner(System.in);
    11         double m[][]=new double[3][4];
    12         System.out.println("Enter a 3-by-4 matrix row:");
    13         for(int i=0;i<m.length;i++){
    14             for(int j=0;j<m[i].length;j++){
    15                 m[i][j]=input.nextDouble();
    16             }
    17         }
    18         
    19         
    20 //        System.out.println("Enter the columnIndex");
    21 //        int columnIndex=input.nextInt();
    22         
    23         int columnIndex=0;
    24         System.out.println("Sum of the elements at column "+columnIndex+" is "+sumColumn(m,columnIndex));
    25         columnIndex=1;
    26         System.out.println("Sum of the elements at column "+columnIndex+" is "+sumColumn(m,columnIndex));
    27         columnIndex=2;
    28         System.out.println("Sum of the elements at column "+columnIndex+" is "+sumColumn(m,columnIndex));
    29         columnIndex=3;
    30         System.out.println("Sum of the elements at column "+columnIndex+" is "+sumColumn(m,columnIndex));
    31     }
    32     public static double sumColumn(double m[][],int columnIndex){
    33         double total=0;
    34         for(int i=0;i<m.length;i++){
    35             total+=m[i][columnIndex];
    36         }
    37         return total;
    38     }
    39 }
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  • 原文地址:https://www.cnblogs.com/cherrydream/p/10174168.html
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