Example using default constructors and getters and setters in cpp. Example is gotten from the book C How to Program.

main.cpp

#include <iostream>
using std::cout;
using std::endl;

#include "Time.h"

int main(){
    Time t1;                  // uses default arguments
    Time t2( 2 );            //  specified hour
    Time t3( 21, 34 );      //   specified hour and minute
    Time t4( 12, 23, 43);  //    all arguments specified
    Time t5( 27, 87, 98); //     invalid arguments

    cout << "Constructed with \n\nt1: using default arguments\n ";
    t1.printUniversal(); // 00:00:00
    cout << "\n ";
    t1.printStandard(); // 12:00:00 AM

    cout << "\n\nt2: specified hour\n ";
    t2.printUniversal(); // 02:00:00
    cout << "\n ";
    t2.printStandard(); // 2:00:00 AM

    cout << "\n\nt3: specified hour and minute\n ";
    t3.printUniversal(); // 21:34:00
    cout << "\n ";
    t3.printStandard(); // 9:30:00 PM

    cout << "\n\nt4: specified hour, minute and second\n ";
    t4.printUniversal(); // 12:23:43
    cout << "\n ";
    t4.printStandard(); // 12:23:43 PM

    cout << "\n\nt5: Invalid arguments\n ";
    t5.printUniversal(); // 00:00:00
    cout << "\n ";
    t5.printStandard(); // 12:00:00 AM

    cout << endl;

    return 0;
}

Time.cpp

// Member-function definition for class time
#include <iostream>
using std::cout;

#include <iomanip>
using std::setfill;
using std::setw;


#include "Time.h"

// constructor initializes each data member to zero
Time::Time(int hr, int min, int sec ){
    setTime( hr, min, sec );
}

void Time::setTime( int hr, int min, int sec ){
    setHour( hr );
    setMinute( min );
    setSecond( sec );
}

// set hour
void Time::setHour( int h ){
    hour = ( h >= 0 && h < 24 ) ? h : 0; // validate hour
}

// set minute
void Time::setMinute( int m ){
    minute = ( m >= 0 && m < 60 ) ? m : 0; // validate minute
}

// set second
void Time::setSecond( int s ){
    second = ( s >= 0 && s < 60 ) ? s : 0; // validate hour
}

// return hour
int Time::getHour(){
    return hour;
}

// return minute
int Time::getMinute(){
    return minute;
}

// return minute
int Time::getSecond(){
    return second;
}

// print Time in universal-time format (HH:MM:SS)
void Time::printUniversal(){
    cout << setfill( '0' ) << setw( 2 ) << getHour() << ":"
	    << setw( 2 ) << getMinute() << ":" << setw( 2 ) << getSecond();
}

// print Time in standard-time format (HH:MM:SS AM or PM)
void Time::printStandard(){
    cout << ( ( getHour() == 0 || getHour() == 12 ) ? 12 : getHour() % 12  )
	    << ":" << setfill( '0' ) << setw( 2 ) << getMinute()
	    << ":" << setw( 2 ) << getSecond() << (hour < 12 ? " AM" : " PM");
}

Time.h

// Declaration of class Time

#ifndef TIME_H
#define TIME_H

// prevent multiple inclusion
class Time{
    public:
        Time(int = 0, int = 0, int = 0 ); // default constructor

        // set functions
        void setTime( int, int, int ); // set hour, minute, second
        void setHour( int );          //  set hour ( after validation )
        void setMinute( int );       //   set minute ( after validation )
        void setSecond( int );      //    set second ( after validation )

        // get functions
        int getHour();     // return hour
        int getMinute();  //  return minute
        int getSecond(); //   return second

        void printUniversal(); // output time in universal-time format
        void printStandard(); //  output time in standard-time format
    private:
        int hour;     // 0 - 23 (24-hour clock format)
        int minute;  //  0 - 59
        int second; //   0 - 59
};

#endif