public ClassRoom(Pupil pupil_1, Pupil pupil_2, Pupil pupil_3, Pupil pupil_4)
{
pupils = new Pupil[] { pupil_1, pupil_2, pupil_3, pupil_4 };
}
public ClassRoom(Pupil pupil_1, Pupil pupil_2)
{
pupils = new Pupil[] { pupil_1, pupil_2 };
}