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. |
| getTotalCost | 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.
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