向上取整用Math.ceil(double a) 向下取整用Math.floor(double a) 举例: public static void main(String[] args) throws Exception { double a = 35; double b = 20; double c = a / b; System.out.println("c===>" + c); // 1.75 System.out.println("c===>"
SELECT round(52.45, 0) AS round4, round(52.54, 0) AS round5, round(52.45, 1) AS round41, round(52.54, 1) AS round51, floor(52.4) AS floor4, floor(52.5) AS floor5, ceiling(52.4) AS ceiling4, ceiling(52.5) AS ceiling5 round是四舍五入 floor是向下取整 ceiling 是向上取