Exercise 15.21

[UIysse]

Hello,
I would argue that Rectangle would inherit from square which inherits from shape.
Instead, you wrote that square inherits rectangle which inherits from shape.

If you think about it, you can have a square with just one side distance member.
You'd need two for a rectangle. To me, rectangle is more elaborate than square. Interested in hearing what you think about this tho.

Cheers and thanks a lot for these great exercises you've put out there.