Enable Automatic Lookup
The cashier function currently asks the user to enter the ISBN number, title, and price of the book being purchased. Modify the function so that once the user enters the ISBN number, it automatically looks up the book title and price. It can do so bs searching for the ISBN number in the ISBN array, and then pulling the title from the title array and the price from the retail array.
If the function cannot locate the ISBN number in the ISBN array, it should display a message indicating so. It then should ask the user if he or she wants to re-enter Ilk number and let the user enter that number again.
Once a book's data has been retrieved, the function should check the Qty array to determine whether there are enough copies in stock to fill the order. If so, the function should subtract the number of copies being purchased from the amount in the arras;. If there aren't enough copies in stock, the function should display a message indicating so, and then return to the main menu.
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