Modify. the addBook Function
Change the addBook function so it works with the file instead of the array of BookData structures. When a new book is added to the inventory, the program will step through the .file, reading each record into a single BookData. structure. The ptogram will then call the isEmpty function.. When it finds an empty struc-ture, it will ask the user for the book's data. The function will then set its variable members to the new data. Once the structure is filled with the new data, it will be written to the file, over the old record.
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