Example2_4(数据的输入Scanner)

import java.util.*;
public class Example2_4{
 public static void main(String arg[]){
  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);
 }
}