a.h

class Time {
    int h;
    int m;
    int s;
public:
    Time(int hh, int mm, int ss);
    int hour()      { return h; }
    int minute()    { return m; }
    int second()    { return s; }
}

class.cpp

#include "a.h"
Time::Time(int hh, int mm, int ss)
{
    h = hh;
    m = mm;
    s = ss;
}

main.cpp

#include <iostream>
#include "a.h"
int main()
{
    Time a(12, 35, 43);
    Time b = a;
    Time c = Time(17, 28, 39);
    
    std::cout << "a = " << a.hour() << "時" << a.minute() << "分" << a.second() << "秒" << endl;
    std::cout << "b = " << b.hour() << "時" << b.minute() << "分" << b.second() << "秒" << endl;
    std::cout << "c = " << c.hour() << "時" << c.minute() << "分" << c.second() << "秒" << endl;
}