题解 | #求小球落地5次后所经历的路程和第5次反弹的高度#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextDouble()) { // 注意 while 处理多个 case
            double a = in.nextDouble();
            double hasRun = 0;
            double lastRunUp = 0;
            double lastRunDown = a;
            for(int i=0;i<5;i++) {
                hasRun += lastRunDown + lastRunUp;
                lastRunDown /= 2;
                lastRunUp = lastRunDown;
            }
            System.out.println(hasRun);
            System.out.println(lastRunUp);
        }
    }
}