定义一个date类如下：

class Date

{

public:

void SetDate(int y,int m,int d)

void IsLeapYear()

private:

int year

int month

int day

}

要求：

(1)编写SetDate(int y,int m,int d)函数，实现对象中数据成员的设置；

(2)编写IsLeapYear()判断该年是否是闰年。 -Define a date class as follows: class Date (public: void SetDate (int y, int m, int d)　void IsLeapYear ()　private: int year　int month　int day )　requirements: (1) preparation SetDate ( int y, int m, int d) function, to achieve the object set of data members　(2) the preparation of IsLeapYear () determine whether the year is a leap year.