题解HJ7 | #取近似值#

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);

        Double x = in.nextDouble();

        if (x - Math.floor(x) >= 0.5)
            System.out.println((int) Math.ceil(x));
        else System.out.println((int) Math.floor(x));
    }
}

向上取整ceil 向下取整floor