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 }

 

转载于:https://www.cnblogs.com/cherrydream/p/10174168.html

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