(Invoice Class)

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 data

membersa part number (type string), a

part description (type string), a quantity of

the item being purchased (type int) and a

price per item (type int).

Your class should have a constructor that

initializes the four data members. Provide a

set and a get function 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 int

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 Invoices capabilities.

The following is a sample of what your output may look like:

Part number: 12345 Part description: Hammer Quantity: 100 Price per item: $5 Invoice amount: $500 quantity cannot be negative, quantity set to Invoice data members modified. Part number: 123456 Part description: Saw Quantity: Price per item $10 Invoice amount: $