'inventory number is a positive integer and numeric 'description is a string and required 'cost, quantity and retail price are required floats, both positive and numeric 'append the inventory item to a file names inventory.txt so multiple items can be written.

Inventory Class Application Inventory Data Inventory Number: Description Retail Price: Quantity On Hand Add Item to File Exit Inventory Class Application Inventory Data Inventory Number: Description Retail Price: Quantity On Hand Add Item to File Exit