Use C$++$ programming with using "using namepace std$"$

In this programming exercise, you will simulate a grocery checkout counter by designing

a CashRegister class that will interact with the StoreInventory class. You will also have

to write the driver program to test your implementation. You must, at the very least, have

the following files:

$(1)$ CashRegister.h $//$contains the CashRegister class declaration

$(2)$ CashRegister.cpp $//$contains the CashRegister class implementation

$(3)$ StoreInventory.h $//$contains the StoreInventory class declaration

$(4)$ StoreInventory.cpp $//$contains the StoreInventory class implementation

$(5)$ GroceryCheckout.cpp $//$driver program to test your class implementations

When a customer $$scans$$ an item at the checkout counter, the CashRegister will perform

the following through a member function:

$1.$ Ask the user for the name of the item and quantity being purchased. Do not accept a

negative value for the quantity.

$2.$ Check with the StoreInventory if that particular item is available in the store and if

sufficient quantity of that item is available for purchase. If the item is not available in

the store or if there is not sufficient quantity in the inventory for that item, the

CashRegister must diplay an appropriate message to the customer and that item must

not be included in the purchase.

$3.$ Get the item$$s cost from the StoreInventory.

$4.$ Add a $30\%$ profit to the cost to get the item$$s unit price.

$5.$ Multiply the unit price times the quantity being purchased to get the purchase subtotal

for that item.

$6.$ Compute a $4\%$ sales tax on the subtotal of that item. $($For the purposes of this

exercise, we are assuming that every item will be charged a sales tax.$)$

$7.$ Add this to the purchase total for that customer.

$8.$ Instruct the StoreInventory to update the inventory entry for that item.

In addition to the above member function, the CashRegister class will also have a default

constructor, a display function and a reset function. The display function will display the

updated total for a customer as each item is $$scanned$($on Windows if you are using

Visual Studio, use system$($cls$)$ to achieve this effect$).$ The reset function will reset the

purchase total before the next customer begins to check out.

The StoreInventory class will store a list of no more than $50$ items, where for each item

the following information is available: name of the item, number of units of that item in

the inventory, cost of one unit of the item $($i$.$e$.,$ unit price$).$ The constructor will initialize

this list from an input file Grocery$-$Inventory.dat. The StoreInventory will have three

member functions in addition to the constructor:

$1.$ Given the name of an item and the number of units required, check if the inventory

has that item and whether it has sufficient quantity of that item and return a boolean

value accordingly.

$2.$ Given the name of an item, return its cost.

$3.$ Given the name of an item and the number of units, update the inventory accordingly.

$($Note: We want this member function to be distinct from that in $(1).)$

You will write a driver program to test your implementations. Your program should

allow for any number of customers to purchase any number of items. At the end of the

day, that is when all customer transactions are done, you should write out the updated

remaining inventory to the file Current$-$Inventory.out. The format of the output file will

be similar to that of the input file.