程序代码：

import java.util.Scanner;
public class Sscanner {
    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个数的和是%f\n",m,sum);
      System.out.printf("%d个数的平均值是%f\n",m,sum/m);
      
    }
}