// times2.cpp
// преобразование времени с использованием конструктора
#include <iostream>
#include <string>
using namespace std;
///////////////////////////////////////////////////////////
class time24
{
  private:
    int hours;
    int minutes;
    int seconds;
  public:
    time24 ( ) : hours ( 0 ), minutes ( 0 ), seconds ( 0 )
      { }
    time24 ( int h, int m, int s ) : hours ( h ), minutes ( m ), seconds ( s )
      { }
    void display ( ) const
      {
        if ( hours < 10 ) cout << '0';
        cout << hours << ':';
        if ( minutes < 10 ) cout << '0';
        cout << minutes << ':';
        if ( seconds < 10 ) cout << '0';
        cout << seconds;
      }
    int getHrs ( ) const;
    int getMins ( ) const;
    int getSecs ( ) const;
};
///////////////////////////////////////////////////////////
class time12
{
  private:
    bool pm;
    int hrs;
    int mins;
  public:
    time12 ( ) : pm ( true ), hrs ( 0 ), mins ( 0 )
      { }
    time12 ( time24 );
    time12 ( bool ap, int h, int m ) : pm ( ap ), hrs ( h ), mins ( m )
      { }
    void display ( ) const
      {
        cout << hrs << ':';
        if ( mins < 10 ) cout << '0';
        cout << mins << ' ';
        string am_pm = pm ? "p.m." : "a.m.";
        cout << am_pm;
      }
};
///////////////////////////////////////////////////////////
time12::time12 ( time24 t24 )
{
  int hrs24 = t24.getHrs ( );

  pm = t24.getHrs ( ) < 12 ? false : true;

  mins = ( t24.getSecs ( ) < 30 ) ? t24.getMins ( ) : t24.getMins ( ) + 1;
  if ( mins == 60 )
  {
    mins = 0;
    ++hrs24;
    if ( hrs24 == 12 || hrs24 == 24 )
      pm = ( pm == true ) ? false : true;
  }
  hrs = ( hrs24 < 13 ) ? hrs24 : hrs24 – 12;
  if ( hrs == 0 )
    { hrs = 12; pm = false; }
}
///////////////////////////////////////////////////////////
int main ( )
{
  int h, m, s;

  while ( true )
  {
    cout << "Введите время в 24-часовом формате: \n";
    cout << "  Часы (от 0 до 23): "; cin >> h;
    if ( h > 23 )
      return ( 1 );
    cout << "  Минуты: "; cin >> m;
    cout << "  Секунды: "; cin >> s;

    time24 t24 ( h, m, s );
    cout << "Исходное время: ";
    t24.display ( );

    time12 t12 = t24;
    cout << "\nВ 12-часовом формате: ";
    t12.display ( );
    cout << "\n\n";
  }
  return 0;
}