is any book which explains what each code means and why it does that in c++,
i am starting in progamming field from beginning.

There are many many books available, but for me it was web based, and still is.
i just look up a keyword or function on msdn.

There are also tutorial websites, infact too many to list, but, here is one I notice a lot
http://www.learncpp.com/

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