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A. Create a method to insert a book (all books must have a category. Ex. Mathematics); B. Create a method to list all books, when books are listed must show the category of the book; C. Create a method to edit (change) a book; D. Create a method to delete a created book; E. Create a function to check the amount of books in stock; F. Create a method to sell of stock. G. Create a method to check the total value of the bookstore box. H. Make a menu method to call the created functions
This link can help in understanding the closure, and the requirements for re-opening the post: What mistake did I make in asking my question?
– Bacco