Problem
Develop a program that could be used as a point-of-order inventory system. Read in a database from a file that represents the store inventory. Each item consists of an ID, a description, a price, a quantity on hand, and a reorder point. Assume that the database can be updated at a terminal by the operator when a customer purchases an item. The quantity purchased for an item is deducted from that item's quantity (if sufficient) and a register receipt is displayed after all purchases are entered. An operator can also process the return of an item by adding the quantity returned to the inventory. A register receipt should also be displayed for a return. Finally, the operator can process new items received from a supplier by adding the items to the database. It should also be possible for an operator to update the price of an item, provided the operator enters the correct security key. Also, the operator should be able to display a list of all items whose quantity on hand is less than the reorder point for that item.