小弟我在重载流插入运算符“<<”和重载流提取运算符“>>”遇到了6个异常，请各位老师指教，多谢

#include <iostream>      
using namespace std;      

class CTime      
{      
private:      
    unsigned short int hour;    // 时      
    unsigned short int minute;  // 分      
    unsigned short int second;  // 秒      
public:      
    CTime(int h=0,int m=0,int s=0);      
    //重载流插入运算符“<<”
    friend ostream& operator << (ostream&,CTime&);
    //重载流提取运算符“>>”
    friend istream& operator >> (istream&,CTime&);
};
CTime::CTime(int h,int m,int s)      
{      
    hour=h;      
    minute=m;      
    second=s;      
}      
//比较运算符(二目)的重载         
ostream& operator << (ostream&output,CTime&c)
{ 
    output<<c.hour <<":"<<c.minute <<":"<<c.second <<endl; 
    return output;
}   
istream& operator >> (istream& input,CTime & c)
{ 
    cout<<"请输入时间：（以aa bb cc的格式输入）";
    input>>c.hour>>c.minute>>c.second;
    return input;
}

void main()      
{      
    CTime t1(8,20,25),t2(11,20,50),t;      
    int n; 
    cin>>t1>>t2;
    cout<<"t1为：";      
    cout<<t1;      
    cout<<"t2为：";      
    cout<<t2;      
    system("PAUSE");      
}