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);
        
        int h = in.nextInt();


        System.out.println(toDo(h));
        System.out.println(toDo2(h));
    }
    public static double toDo (int a){
        double b = a;
        double c = a;
        for (int i = 1 ;i<5 ; i ++){//b初始化成a了所以循环四次即可
		  //下落时经历的路程包括下去和上来，所以是b = b + c/2*2 -->b = b + c;
            b = b + c;
            c = c/2.0;
        }
        return b;
    }
    public static double toDo2(int a ){

        double b = a;
        for (int i = 0;i<5;i++){
            b=b/2;
        }
        return b;
    }
}