Answer in C++ and put the class in a separate header file. Thanks

6. Inventory Class Design an Inventory class that can hold information and calculate data for items in a retail store's inventory. The class should have the following private m ember variables: Variable Name itemNumber quantity cost totalCost Description An int that holds the item's item number. An int for holding the quantity of the items on hand A double for holding the wholesale per-unit cost of the item A double for holding the total inventory cost of the item (calculated as quantity times cost). The class should have the following public member functions: Member Function Description Default Constructor Constructor #2 Accepts an item's number, cost, and quantity as arguments. T Sets all the member variables to 0. he function should copy these values to the appropriate member variables and then call the setTotalCost function. Accepts an integer argument that is copied to the itemNumber member variable. Accepts an integer argument that is copied to the quantity member variable setItemNumber setQuantity setCost Accepts a double argument that is copied to the cost member variable. Calculates the total inventory cost for the item (quantity times cost) and stores the result in totalcost. Returns the value in itemNumber Returns the value in quantity. setTotalCost getItemNumber getQuantity getCost getTotalcost Returns the value in cost. Returns the value in totalCost. Demonstrate the class in a driver program. Input Validation: Do not accept negative values for item number, quantity, or cost