第7周-项目2-友元类

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问题及代码：

#include<iostream>using namespace std;class Date{public:    Date(int, int, int);    friend class Time;private:    int mouth;    int day;    int year;}; Date::Date(int mh,int d,int y) {     mouth=mh;     day=d;     year=y; }class Time{public:    Time(int,int,int);    void add_a_second(Date &);    void display(Date &);private:    int hour;    int minute;    int sec;}; Time::Time(int h,int m,int s) {     hour=h;     minute=m;     sec=s; }void Time::add_a_second(Date &d1){    sec=sec+1;    if(sec>59)    {        minute=minute+sec/60;        sec=sec%60;    }    if(minute>59)    {        hour=hour+minute/60;        minute=minute%60;    }    if(d1.mouth>12)    {        d1.year=d1.mouth/12+d1.year;        d1.mouth=d1.mouth%12;    }    if(d1.day>31)    {        d1.mouth=d1.day/31+d1.mouth;        d1.day=d1.day%31;    }} void Time::display(Date &d1) {     cout<<d1.year<<"/"<<d1.mouth<<"/"<<d1.day<<" ";     cout<<hour<<":"<<minute<<":"<<sec<<endl; }int main(){    int i;    Time t1(23,59,32);    Date d1(12,31,2013);    for(i=0;i<=100;i++)    {        t1.add_a_second(d1);        t1.display(d1);    }    return 0;}

运行结果：

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