C program inventory for a bookstore.

I need a system that will let you enter your inventory and store it in a file. I also should be able to sort it, and update it. For the items in the inventory, I will be keeping track of its information (name, publisher, year, author, pages, price).

The system will allow you to keep track of who purchases the items from the store (name, address, telephone, what they bought, how much they paid). This information should also to be stored in a file that is seperate from the inventory file.

The program should open with a menu that allows me to see the inventory (provide at least 3 ways of looking at the inventory - unsorted, and 2 sorted views by title and author.

The program should let me search the inventory by 1- author, 2- year and 3-title.

The program should also let me then enter a customer's data and what they bought. I should then also be able to see the list of customer's (sorted and unsorted) and also search the customer list based upon city phone and their name.

I should also be able to delete inventory and customers.

C using stdio.h