Introduction - If you have any usage issues, please Google them yourself
Define a Book class that includes:
Data members: bookname, price, number (the number of books)
Member functions:
(display) / / display the situation of books "
(borrow) / / storage minus 1, and displays the current number of books
(restore) / / add storage 1, and displays the current number of books
In the main () function, a number of books are required to be created and a simple display, loan, and return management of the book is made.