package com.liu.scanner;

import java.util.Scanner;

public class Demo5 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double sum = 0;
        for (int i =0; ; i++) {
            if (scanner.hasNextDouble()){
                double x = scanner.nextDouble();
                sum = sum+x;
                System.out.println("您输入第"+(i+1)+"个数字，当前结果sum="+sum);
            }else{
                System.out.println(i+"个数的和为"+sum);
                System.out.println(i+"个数的平均值为"+sum/i);
                break;//不是用return
            }
        }
        scanner.close();
    }
}

Scanner拓展