Date class whose member variables are: year, month, day, member functions are: output date function, set the date function, and interpretation of leap year and leap year date plus 1 function function.

详细说明： Date类，其成员变量有：年、月、日，成员函数有：输出日期函数、设置日期函数、判读平年与润年函数和日期加1函数。

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Guitars function normally every day of the month.

吉他没有不方便的日子。

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