when i saw the porgram of the leap year ,i became so muddle.I was not understand the means of the expound.Subsequently ,I tumbled to the porgram.It needed to sides:   The first side was the year could be devided exactly by 4,not by 100.   The second side was if the year was devidedy exactly by 100,at the same time it must be devided exactly by 400.   If the year satified all the requirements ,the year was the leap year.

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