Review beginners exercises Day 2

[chavid]

@ALL If the ExerciceSchedule_EssentialCourse.md is up to date, Day 2, there is an exercise about virtual inheritance which seems to me completely irrelevant for beginners. On the contrary, something about object-functions (operator()) would help a lot for the template/stl exercises of Day 3. Either it deserves its own exercise, or it should be integrated in the operators exercise. For example, we may transform printAndCheck() into an object-function which store the maximum title length as a member variable (currently 40).

[chavid]

Actually, it lacks at the beginning of Day 2 an exercise about the creation of a simple class. That may be Fracrion, without the operators...

[chavid]

@ALL, my proposal:

• extract from current "operators" the creation of a class Fraction, all made with named methods and functions, a make it an introduction exercise about creating a class, with constructors, destructors, assignment.
• as a second exercise, "operators", as I suggested in About operators exercise #439, plus the operator() as said above.
• as a third exercise, "polymorphism".
• keep "virtual inheritance" at last, if you care.

[stale]

This issue or pull request has been automatically marked as stale because it has not had recent activity. Please manually close it, if it is no longer relevant, or ask for help or support to help getting it unstuck. Let me bring this to the attention of @klieret @wdconinc @michmx for now.