运算

//// Created by moon on 9/7/17.//#include <iostream>using namespace std;class Date{private:    int Day,Month,Year;public:    Date(int InputDay,int InputMonth,int InputYear):Day(InputDay),Month(InputMonth),Year(InputYear){};    //返回值，＋完之后会得到值。＆，证明是返回本身。    Date& operator +(int DaysToAdd){        Day+=DaysToAdd;        return *this;    }    void DisplayDate(){        cout<<Day<<"/"<<Month<<"/"<<Year<<endl;    }};int main(){    Date Holiday(25,12,2011);    Holiday.DisplayDate();    Date fuck(Holiday);    Date sex = Holiday+7;    sex.DisplayDate();}