日期类

实现一个日期类，包含缺省值的构造函数、赋值操作符的重载、对==的重载

#include <iostream>using namespace std;class Date{private:int _year;int _month;int _day;public:void Display(){cout << "" << this << endl;cout << this->_year << "-" << this->_month << "-" << this->_day << endl;}Date(int year = 1900, int month = 1, int day = 1){cout << "Date(int year = 1900, int month = 1, int day = 1)" << endl;_year = year;_month = month;_day = day;}bool operator==(const Date& d){return _year == d._year&&_month == d._month &&_day == d._day;}Date& operator=(const Date& d){cout << "赋值运算符的重载" << endl; _year = d._year;_month = d._month;_day = d._day;}};int main(){Date d1(2015,8,23);d1.Display();Date d2(2016, 8, 23);d2.Display();Date d3(d2);cout << "d1==d2?" << (d1 == d2) << endl;cout << "d2==d3?" << (d2 == d3) << endl;getchar();return 0;}