用重载时间相加

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#include<iostream>
#include<string>
using namespace std;
class Time
{
public:
void display(){cout<<hour<<":"<<minute<<":"<<sec<<endl;}
protected:
int hour;
int minute;
int sec;
};
class Date
{
public:
void display1(){cout<<year<<":"<<month<<":"<<day<<endl;}
protected:
int year;
int month;
int day;
};
class DateTime:public Time,public Date
{
public:
friend istream& operator >>(istream &input,DateTime &t1);
friend ostream& operator <<(ostream &output,DateTime &t1);
friend DateTime operator +(DateTime &t1,DateTime &t2);
friend DateTime operator -(DateTime &t1,DateTime &t2);
private:
string place;
};
istream& operator >>(istream &input,DateTime &t1)
{
input>>t1.place>>t1.year>>t1.month>>t1.day>>t1.hour>>t1.minute>>t1.sec;
return input;
}
ostream& operator<<(ostream &output,DateTime &t1)
{
output<<t1.place<<":"<<t1.year<<"/"<<t1.month<<"/"<<t1.day<<"/"<<t1.hour<<":"<<t1.minute<<":"<<t1.sec;
return output;
}
DateTime operator +(DateTime &t1,DateTime &t2)
{
DateTime t3;
t3.sec=t1.sec+t2.sec;
t3.minute=t1.minute+t2.minute;
t3.hour=t1.hour+t2.hour;
t3.day=t1.day+t2.day;
t3.month=t1.month+t2.month;
t3.year=t1.year+t2.year;
t3.place=t1.place;
if(t3.sec>60)
{
t3.sec-=60;
t3.minute+=1;
}
if(t3.minute>60)
{
t3.minute-=60;
t3.hour+=1;
}
if(t3.hour>24)
{
t3.hour-=24;
t3.day+=1;
}
if(t3.month==1||3||5||7||8||10||12)
{
if(t3.day>31)
{
t3.day-=31;
t3.month+=1;
}
}
if(t3.month==4||6||8||10||11)
{
if(t3.day>30)
{
t3.day-=30;
t3.month+=1;
}
}
if(t3.month==2)
{
if(t3.day>28)
{
t3.day-=28;
t3.month+=1;
}
}
if(t3.month>12)
{
t3.month-=12;
t3.year+=1;
}
return t3;
}
DateTime operator -(DateTime &t1,DateTime &t2)
{
DateTime t3;
t3.sec=t1.sec-t2.sec;
t3.minute=t1.minute-t2.minute;
t3.hour=t1.hour-t2.hour;
t3.day=t1.day-t2.day;
t3.month=t1.month-t2.month;
t3.year=t1.year-t2.year;
t3.place=t1.place;
if(t3.sec<0)
{
t3.sec+=60;
t3.minute-=1;
}
if(t3.minute<0)
{
t3.minute+=60;
t3.hour-=1;
}
if(t3.hour<0)
{
t3.hour+=24;
t3.day-=1;
}
if(t3.month==1||3||5||7||8||10||12)
{
if(t3.day<0)
{
t3.day+=31;
t3.month-=1;
}
}
if(t3.month==4||6||8||10||11)
{
if(t3.day<0)
{
t3.day+=30;
t3.month-=1;
}
}
if(t3.month==2)
{
if(t3.day<0)
{
t3.day+=28;
t3.month-=1;
}
}
if(t3.month<0)
{
t3.month+=12;
t3.year-=1;
}
return t3;
}
int main()
{
DateTime d1,d2,d3,d4;
cout<<"地点："<<'t'<<"年："<<'t'<<"月"<<'t'<<"日"<<'t'<<"时"<<'t'<<"分"<<'t'<<"秒"<<endl;
cin>>d1;
cin>>d2;
cout<<"两时间相加为："<<endl;
d3=d1+d2;
d4=d1-d2;
cout<<d3<<endl;
cout<<"两时间相减为："<<endl;
cout<<d4<<endl;
}