C++练习继承类

来源：互联网发布：淘宝信用卡套现骗局编辑：程序博客网时间：2024/05/22 17:26
#include <iostream>using namespace std；class Time{public:    Time(){}    Time(int h,int m,int s)    {     hour=h;     minute=m;     second=s;    }    friend istream & operator>>(istream &,Time &);    friend ostream & operator<<(ostream &,Time &);    void operator =(Time &);    friend bool operator >(Time &t1,Time &t2);    friend bool operator <(Time &t1,Time &t2);    friend bool operator ==(Time &t1,Time &t2);    friend void compare(Time &,Time &);    void display()    {     cout<<hour<<":"<<minute<<":"<<second<<endl;    }    int hour;    int minute;    int second;};istream & operator>>(istream &input,Time &t1){ input>>t1.hour>>t1.minute>>t1.second; return input;}ostream & operator<<(ostream &output,Time &t1){ output<<t1.hour<<":"<<t1.minute<<":"<<t1.second; return output;}void Time::operator =(Time & t1){  hour=t1.hour;  minute=t1.minute;  second=t1.second;}bool operator >(Time &t1,Time &t2){ if(t1.hour>t2.hour)     return true; else if(t1.hour==t2.hour&&t1.minute>t2.minute)     return true; else if(t1.hour==t2.hour&&t1.minute>t2.minute&&t1.second>t2.second)     return true; else     return false;}bool operator <(Time &t1,Time &t2){ if(!operator >(t1,t2))     return true; else     return false;}bool operator ==(Time &t1,Time &t2){ if(t1.hour==t2.hour&&t1.minute==t2.minute&&t1.second==t2.second)     return true; else     return false;}void compare(Time &t1,Time &t2){ if(operator>(t1,t2))     cout<<"t1>t2"; if(operator<(t1,t2))     cout<<"t1<t2"; if(operator==(t1,t2))     cout<<"t1=t2";}class Date{public:    Date(){}    Date(int y,int mo,int d)    {     year=y;     month=mo;     day=d;    }    void get_value()    {     cin>>year>>month>>day;    }    void show()    {     cout<<year<<"-"<<month<<"-"<<day<<endl;    }protected:    int year;    int month;    int day;};class DateTime:public Date,public Time{public:     DateTime(){}    DateTime(int y,int mo,int d,int h,int m,int s):Date(y,mo,d),Time(h,m,s){}    DateTime operator -(DateTime &c2);    DateTime operator +(Time &t1);    DateTime operator -(Time &t1);    void show()    {     cout<<year<<"-"<<month<<"-"<<day<<" "<<hour<<":"<<minute<<":"<<second<<endl;    }};DateTime DateTime::operator -(DateTime &c2){ DateTime c3; c3.year=year-c2.year; c3.month=month-c2.month; c3.day=day-c2.day; c3.hour=hour-c2.hour; c3.minute=minute-c2.minute; c3.second=second-c2.second; return c3;}DateTime DateTime::operator +(Time &t1){ DateTime c3; c3.year=year; c3.month=month; c3.day=day; c3.hour=hour+t1.hour; c3.minute=minute+t1.minute; c3.second=second+t1.second; return c3;}DateTime DateTime::operator -(Time &t1){ DateTime c3; c3.year=year; c3.month=month; c3.day=day; c3.hour=hour-t1.hour; c3.minute=minute-t1.minute; c3.second=second-t1.second; return c3;}int main(){ Time t1(12,20,30),t2(10,21,25); cout<<" t1="<<t1<<endl; cout<<" t2="<<t2<<endl; Time t3,t4; cout<<" t3=:"; cin>>t3; cout<<" t3="<<t3<<endl; cout<<"t1=t4"<<endl; t4=t1; cout<<" t4="; t4.display(); cout<<"比较时间t1和时间t2:"; compare(t1,t2); Date d1; cout<<endl; cout<<" d1:"; d1.get_value(); cout<<" d1="; d1.display(); DateTime c1(1996,10,12,12,20,14),c2(1994,4,12,10,1,2); DateTime c3,c4,c5; cout<<" c3=c 1-c2:"<<endl; c3=c1-c2; cout<<" c3="; c3.display(); cout<<" c4=c1+ t1:"<<endl; c4=c1+t1; cout<<" c4="; c4.display(); cout<<" c5= c1- t1:"<<endl; c5=c1-t1; cout<<" c5="; c5.display(); return 0;}
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