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 members—a 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. A constructor that receives multiple arguments is defined with the form:
ClassName( TypeName1 parameterName1, TypeName2 parameterName2, ... )
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 and print "quantity cannot be negative. quantity set to 0."
If the price per item is not positive, it should be set to 0 and print "pricePerItem cannot be negative. pricePerItem set to 0."
Write a test program that demonstrates class Invoice’s capabilities.

The first line contains the part number, part descirption, quantity of the item being purchased and a price per item.
The second line contains the new part number, new part descirption, new quantity of the item being purchased and a new price per item.

The main function have been given, please implement the Invoice class.