基础上定义构造成员函数

#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
class Time
{
    public:
        Time()
        {
            hour=0;
            minute=0;
            sec=0;
        }
    void set_time();
    void show_time();
    private:
        int hour;
        int minute;
        int sec;
};

void Time::set_time()
{
    cin>>hour;
    cin>>minute;
    cin>>sec;
}

void Time::show_time()
{
    cout<<hour<<":"<<minute<<":"<<sec<<endl;
}

int main(int argc, char** argv) {
    Time t1;
    t1.set_time();
    t1.show_time();
    Time t2;
    t2.show_time();
    return 0;
}