which program is used in libraries and supermarket to clear goods incoming and leaving?

As with your other question, google for RFID.

First of all you should think a little bit on the problem, make a requirement list... once you've prepared that start dividing the steps to get the job done...

Surely you'll need to ask for some data to the user... get familiar on how to do that cin and cout...
Then you'll have to store data... As a database has not been mentioned in any place... I guess this is a low level exercise... so you should think on arrays or linked lists.

This should be enough for you to start working...




From now on you will find extra spoilers...

Do you have a specific number of books?

If you would say that there are a specific number of books and shelves...

I would go for an array with some dimensions:

Spaces[MaxBooksNumberAllowed].

Each array position should be a structure with the fields you would need:

1. Book name.
2. State of the book. (1 is in the shelf, 0 is out).
3. shelf.
4. position in the shelf.
...

Then you should ask the operator of the program for an action:

1. Do you want to search for a book?
2. Do you want to insert a book?
3. Do you want to take a book?

then it is as easy as search for the book and act as deserved (removing it), insert a book (ask for the position or search for an empty slot and put it there)...

Good luck!