Question

C++编程编写一个时间类time，包含时，分，秒数据成员实现时间的加，减，输入和输出，其中时

间的加减要通过运算符重载，谢谢，着急用。不好意思没有财富值了

Answer 1

#include <iostream>
using namespace std;
class time
{
    int hour;
    int min;
    int sec;
public:
    time(int h=0,int m=0,int s=0)
    {
        hour=h;min=m;sec=s;
    }
    ~time(){}
  friend time operator+(time t1,time t2);
  friend time operator-(time t1,time t2);
     void operator=(time);
    friend ostream& operator<<(ostream &,time);
    friend istream& operator>>(istream &,time);
};
int main()
{
    time t1,t2(100,300,500),t3(1,2,3);
    cout<<t1<<endl;
    cout<<t2<<endl;
    cout<<t3<<endl;
    cout<<t2-t3<<endl;
    cout<<t2+t3<<endl;
    t3=t2;
    cout<<t3<<endl;
}
time operator+(time t1,time t2)
{
    time t3;
    t3.hour=t1.hour+t2.hour;
    t3.min=t1.min+t2.min;
    t3.sec=t1.sec+t2.sec;
    while(t3.sec>=60)
    {
        t3.sec-=60;
        t3.min++;
    }
    while(t3.min>=60)
    {
        t3.min-=60;
        t3.hour++;
    }
    return t3;
}
time operator-(time t1,time t2)
{
    time t3;
    t3.hour=t1.hour-t2.hour;
    t3.min=t1.min-t2.min;
    t3.sec=t1.sec-t2.sec;
    while(t3.sec<0)
    {
        t3.sec+=60;
        t3.min--;
    }
    while(t3.min<0)
    {
        t3.min+=60;
        t3.hour--;
    }
    return t3;
}
void time::operator=(time t)
 {
    hour=t.hour;
    min=t.min;
    sec=t.sec;
 }
ostream& operator<<(ostream &os,time t)
{
    while(t.sec>=60)
    {
        t.sec-=60;
        t.min++;
    }
    while(t.min>=60)
    {
        t.min-=60;
        t.hour++;
    }
    os<<t.hour<<" :"<<t.min<<":"<<t.sec<<endl;
    return os;
}
istream& operator>>(istream &is,time t)
{
is>>t.hour>>t.min>>t.sec;
return is;
}