作业7.11

#include<iostream>using namespace std;class Date{public:Date(){}Date(int a){day=a;year=0;month=0;}Date(int y,int m,int d){year=y;month=m;day=d;}void print(){cout<<year<<"."<<month<<"."<<day<<endl;}Date operator +(Date & b){day+=b.day;return *this;}private:int month;int day;int year;};int main(){    Date d1(2015,6,29),d2;      cout<<"日期d1:"<<"  ";      d1.print();      d2=d1+Date(1);      cout<<"日期d1加天数1后的日期:"<<"  ";      d2.print();       return 0;}