# your code goes here
# 题目4:闰年判断
# 要求:判断输入的年份是否为闰年。
# 闰年规则:能被4整除但不能被100整除,或者能被400整除。
n = int(input('请输入年:'))
if n%4==0 and n%100!=0 or n%400==0:
print ('n'+"年是闰年")
else :
print ('n'+"年不是闰年")
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