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Open closed principle

Hello please explain this idea.I got this from Martin book.

They are closed for modification. Extending the behavior of a module does not result in changes

to the source, or binary, code of the module. The binary executable version of the

modulewhether in a linkable library, a DLL, or a .EXE fileremains untouched.

thanks in advance

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Suthish Nair13y ago
http://mmwaikar.wordpress.com/guru-gyaan/programming-books/agile-principles-patterns-and-practices-in-c/chapter-9-the-open-closed-principle/