c++类训练

# include <iostream>
# include <string>
# include <iomanip>
using namespace std;
class Time 
{
private:
    int hour;
    int minute;
    int second;
public:
    void set_time()
    {
        cin>>hour>>minute>>second;
    }
    void show_time()
    {
        if(hour<=0 || hour >12)
            hour=12;
        if(minute<0 || minute >60)
            minute=0;
        if(second<0 || second>60)
            second=0;
        cout<<setw(2)<<setfill('0')<<hour<<':'; //setw设置域宽，setfill是指定你用什么字符填充。
        cout<<setw(2)<<setfill('0')<<minute<<':';
        cout<<setw(2)<<setfill('0')<<second<<endl;
    //    cout<<hour<<':'<<minute<<':'<<second<<endl;
    }
};
int main()
{
    Time t1;
    t1.set_time();
    t1.show_time();
    return 0;
}