#include<iostream> #include<iomanip> using namespace std; //运算符重载实例 class Time { private: int hour; int minute; int second; public: Time(); Time(int h, int m, int s); //此处为<<运算符重载的友元声明 friend ostream& operator<<(ostream& os,const Time& t); //此处为>>运算符重载的友元声明 friend istream& operator<<(istream& is,Time& t); }; //此处为<<运算符重载的实现,注意，电子时钟的显示要保证两位，缺少则添零补齐，如03:35:08。 ostream& operator<<(ostream& os,const Time& t) { os << setw(2) << setfill('0') << t.hour << ":" << setw(2) << setfill('0') << t.minute << ":" << setw(2) << setfill('0') << t.second << endl; return os; } //----------------------------------------------------------------------- //此处完成>>运算符重载的实现 istream& operator>>(istream& is,Time& t) { is >> t.hour >> t.minute >> t.second; return is; } //------------------------------------------------------------------------- Time::Time() { hour = 0; minute = 0; second = 0; } Time::Time(int h, int m, int s) { hour = h; minute = m; second = s; } int main() { //定义一个时钟对象t，输入时分秒后，输出。 Time t; cin >> t; cout << t; return 0; }修正代码

修正后的代码如下：

#include<iostream> 
#include<iomanip> 

using namespace std;

//运算符重载实例  
class Time {
private:
    int hour;
    int minute;
    int second;
public:
    Time();
    Time(int h, int m, int s);
    //此处为<<运算符重载的友元声明  
    friend ostream& operator<<(ostream& os,const Time& t);
    //此处为>>运算符重载的友元声明  
    friend istream& operator>>(istream& is,Time& t);
};

//此处为<<运算符重载的实现,注意，电子时钟的显示要保证两位，缺少则添零补齐，如03:35:08。
ostream& operator<<(ostream& os,const Time& t) {
    os << setw(2) << setfill('0') << t.hour << ":" << setw(2) << setfill('0') << t.minute << ":" << setw(2) << setfill('0') << t.second << endl;
    return os;
}

//-----------------------------------------------------------------------  
//此处完成>>运算符重载的实现  
istream& operator>>(istream& is,Time& t) {
    is >> t.hour >> t.minute >> t.second;
    return is;
}

//-------------------------------------------------------------------------  

Time::Time() {
    hour = 0;
    minute = 0;
    second = 0;
}

Time::Time(int h, int m, int s) {
    hour = h;
    minute = m;
    second = s;
}

int main() {
    //定义一个时钟对象t，输入时分秒后，输出。  
    Time t;
    cin >> t;
    cout << t;

    return 0;
}

主要修改了 `operator>>` 的定义，原先写的是输出运算符 `operator<<` 的声明。同时，将 `operator<<` 的输出语句修改为只输出不换行。