(Invoice Class)

Question

Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store. An Invoice should include four pieces of information as data members part number (type string), a part description (type string), a quantity of the item being purchased (type int) and a price per item (type double). Your class should have a constructor that initializes the four data members. Provide a set and a get accessors for each data member. In addition, provide a member function named getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as an double value. If the quantity is not positive, it should be set to 0. If the price per item is not positive, it should be set to 0. Write a test program that demonstrates class Invoice's capabilities.