package com.company;

public class Main {

    public static void main(String[] args) {

        //向上取整

        System.out.println(Math.ceil(11.3));//12.0

        System.out.println(Math.ceil(-11.3));//-11.0

        //向下取整

        System.out.println(Math.floor(11.3));//11.0

        System.out.println(Math.floor(-11.3));//-12.0

        //四舍五入 算法为Math.floor(x+0.5) 即原来的数字加上0.5再向下取整

        System.out.println(Math.round(11.4));//

        System.out.println(Math.round(11.5));//

        System.out.println(Math.round(11.6));//

        System.out.println(Math.round(-11.4));//-11

        System.out.println(Math.round(-11.5));//-11

        System.out.println(Math.round(-11.6));//-12

    }

}