#include <iostream> using namespace std; class Date { public: Date(int year = 2000, int month = 1, int day = 1) :_year(year) , _month(month) , _day(day) { } int GetMonthDay(int year, int month); //声明 //流插入 friend ostream& operator<<(ostream& out, const Date& d); Date operator+ (int n); p...