自己编写一段程序判断一个年份(比如1900年)是否是闰年,是则显示1900年为闰年,否则显示1900年不是闰年. -I have written a program to determine whether a year (such as 1900) is a leap year, is the show in 1900 as a leap year, otherwise show that 1900 was not a leap year.