流程控制-scanner进阶

Scanner进阶

• 简单的交互

代码

package com.frey.scanner;

import java.util.Scanner;

public class Demo05 {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        double sum=0;
        int count=0; //count为输入数字个数

        while (scanner.hasNextDouble()) 
        {
            double n=scanner.nextDouble();
            sum+=n;
            count++;
            System.out.println("你输入了第"+count+"个数据，当前sum为"+sum);
        }

        System.out.println(count+"个数的和为"+sum);
        System.out.println(count+"个数的平均值为"+(sum/count));

        scanner.close();
    }
}