编写程序，判断给定的某个年份是否是闰年。

闰年的判断规则如下：

（1）若某个年份能被4整除但不能被100整除，则是闰年。

（2）若某个年份能被400整除，则也是闰年。-Write a program to determine whether a given year is a leap year. Judgment leap year rules are as follows: (1) If a year divisible by 4 but not divisible by 100, it is a leap year. (2) If a year is divisible by 400, it is a leap year.