as a manager, manage the store inventory using a menu for:

manager - add item

manager - update quantity

manager -change price

manager -list all items

The inventory should be stored as a binary file on disk (Inventory File as binary file with random access)

as a customer:

be able to change password ( use the hash function to convert the password string before storing the value)

be able to clear shopping cart

be able to buy items in cart

this should update the quantity in stock or throw an exception if the quantity in the cart is larger than the quantity in stock

code that will display the order total and ask for pretend credit card payment info

code that will clears the cart after a successful purchase

-manage shopping cart ( add, update quantity, delete items from cart )

-- each shopping cart should be stored as a binary file so the customer can come back to the cart anytime