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You should always learn from what you are doing I believe, its the way forward :D

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Not really actually, your method there makes no real sense as all it does it deduct one from the original variable and then return it, you have effectively created a wrapper method for --variable.
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Well this depends, how tight coupled do you want the class cat and mouse to be? In theory they should be as loosely coupled as possible meaning the class cat should only do its own stuff and the...