Using C++ 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 instance variablesa part number, a part description, a quantity of the item being purchased (type int), and a price per item (double).Your class should have a constructor that initializes the four instance variables. Provide a set and a get function for each instance variable. In addition, provide a function named getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as a 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 0.0. Write a main function that tests the class Invoices capabilities.

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