2例子4.txt

这是一本java基础教程 对新手上路有很大帮助

import java.util.*;
public class Example2_4{
    public static void main (String args[ ]){
       Scanner reader=new Scanner(System.in);
       double sum=0;
       int m=0;
       while(reader.hasNextDouble()){
           double x=reader.nextDouble();
           m=m+1;
           sum=sum+x;
       }
       System.out.printf("%d个数的和为%f\n",m,sum);
       System.out.printf("%d个数的平均值是%f\n",m,sum/m); 
    }
}