OO Concept: Liskov Substitution Principle

Hi,

Just read an article talking about the LSP in term of OO design:
http://www.objectmentor.com/resources/articles/lsp.pdf

The article said Rectangle class should not be a superclass of Square
class.

Okay, so how you would design the Rectangle & Square class?


The article did not cover that, so what are your opinion?


Howard
.

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