文件名称:Judgelegitimatedate
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设int year,month,day分别表示一个日期中的年月日，试编程求
对于任意三个整数，判断其是否为一个合法的日期值。
给定一个日期值，计算若干天后的日期值
如果有两个日期值，计算他们相距的天数。-Set int./year, respectively, in a date (try programming
For any three integers, decide whether it is a valid date value.
Given a date, calculation of some days after date value
If there are two date value calculation, they are the days.
对于任意三个整数，判断其是否为一个合法的日期值。
给定一个日期值，计算若干天后的日期值
如果有两个日期值，计算他们相距的天数。-Set int./year, respectively, in a date (try programming
For any three integers, decide whether it is a valid date value.
Given a date, calculation of some days after date value
If there are two date value calculation, they are the days.
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Judgelegitimatedate.cpp