Chapter 7, Problem 7PC

Inventory Class

Design an Inventory class that can hold information for an item in a retail store’s inventory. The class should have the following private member variables.

Variable Name	Description
itemNumber	An int that holds the item’s number.
quantity	An int that holds the quantity of the item on hand.
cost	A double that holds the wholesale per-unit cost of the item

The class should have the following public member functions.

Member Function	Description
default constructor	Sets all the member variables to 0.
constructor #2	Accepts an item’s number, quantity, and cost as arguments. Calls other class functions to copy these values into the appropriate member variables. Then calls the setTotalCost function.
Member Function		Description
setItemNumber		Accepts an int argument and copies it into the itemNumber member variable.
setQuantity		Accepts an int argument and copies it into the quantity member variable.
setCost		Accepts a double argument and copies it into the cost member variable.
getItemNumber		Returns the value in itemNumber.
getQuantity		Returns the value in quantity.
getCost		Returns the value in cost.
gotTotalCost		Computes and returns the totalCost.

Demonstrate the class by writing a simple program that uses it. This program should validate the user inputs to ensure that negative values are not accepted for item number, quantity, or cost.