c++运算符重载"<<"出错

问题遇到的现象和发生背景

时间类运算符重载"<<"出错

用代码块功能插入代码，请勿粘贴截图

```c++
#include
using namespace std;
class Time{
    friend istream & operator>>(istream &in,Time &t)
{
int h,m,s;
cin>>h>>m>>s;
t.Hour=h;
t.Minute=m;
t.Second=s;
return in;
}
friend ostream & operator<<(ostream & out,Time&t)
{
cout<':'<':'<return out;
}
    public:
        Time();
        Time(int NewH,int NewM,int NewS);
        void ShowTime();
        void ShowTime(int i);
//        void SetTime(int,int,int);
        Time&operator++();//前置++ 
        const Time operator++(int);//后置++ 
        Time operator>>(Time &t);
        ~Time(){cout<<"GoodBye!"<private:
    int Hour,Minute,Second;
        
};
Time::Time(int NewH,int NewM,int NewS){Hour=NewH<0||NewH>23?0:NewH;
    Minute=NewM<0||NewM>59?0:NewM;
    Second=NewS<0||NewS>59?0:NewS;
}
Time::Time(){Hour=0;
    Minute=0;
    Second=0;} 
void Time::ShowTime()
{
    cout<":"<":"<//void Time::SetTime(int NewH,int NewM,int NewS){
//    Hour=NewH<0||NewH>23?0:NewH;
//    Minute=NewM<0||NewM>59?0:NewM;
//    Second=NewS<0||NewS>59?0:NewS;
//}

void Time::ShowTime(int i){
    cout<<(Hour>12?Hour-12:Hour)<<":"<":"<12?"PM":"AM")<operator++()//前置++ 
{
    Second++;
    if(Second>=60){
        Second=Second%60;
        ++Minute;
        if(Minute>=60){
        Minute=Minute%60; 
        ++Hour;    
        }
}
    return *this;
}
const Time Time::operator++(int){
    Time t=*this;
    Second+=1;
    if(Second>60){
        Second=Second%60;
        ++Minute;
        if(Minute>=60){
        Minute=Minute%60; 
        ++Hour;    
        }
    }

}

int main(){
    Time myTime,t;
//    myTime.SetTime(8,30,30);
//    myTime.ShowTime();
//    myTime.SetTime(20,29,59);
//    myTime.ShowTime();
//    ++myTime;
//    myTime.ShowTime();
//    myTime++;
    cin<return 0;
}



![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/576858745766164.png "#left")

cin<<t;改为cin>>t;