I$\text{'}$m having a hard time figuring out the structure of the two cpp files and the header file. Thanks!

# Farmers Market Booth

$---$

## Objectives

Demonstrate knowledge about the following topics:

$-$ Functions

$-$ Namespaces

$-$ Pass by Reference

### The Problem to Solve

A local farmers market booth sold strawberries. Customers loved their strawberries so much that

the booth owners decided to start selling strawberry related products alongside the

strawberries. These strawberry products included strawberry jam, chocolate covered

strawberries, and glazed strawberry scones.

Before the addition of the strawberry products it was easy for the booth owners to keep track of

the profit from the strawberry sales since raw, freshly grown products receive the discounted

tax rate of $3\%.$ However, prepared products do not. Instead, they are taxed at the usual rate of $6\mathrm{.}10\%.$ So$,$ the strawberry booth owners hired you

to create a basic program to correctly calculate the total for each sale.

This program needs to calculate the tax based on the last inputted product. It should then update the customer's total with that last product's price $+$ tax.

### Files to Work on

You will be working in the following files:

All functions will be part of the library order. The library consists of these two files:

$-\text{'}$src$/$order$.$cpp$\text{'}$

$-\text{'}$src$/$order$.$h$\text{'}$

Our "driver" file will be

$-\text{'}$src$/$main$.$cpp

## Order Library

Create a library of functions to handle tasks that calculate a farmers market booth order

### order.h

$1.$ Create a namespace called order

$2.$ In that namespace define the following:

$-$ Constant called DISCOUNTED$\_$RATE with the value of $\mathrm{.}03$

$-`$const DISCOUNTED$\_$RATE $=\mathrm{.}03$;$`$

$-$ Constant called NORMAL$\_$RATE with the value of $\mathrm{.}061$

$-`$const NORMAL$\_$RATE $=\mathrm{.}061$;$`$

$-$ Function prototypes for the functions described in the next part.

### order.cpp

Make sure to add any necessary header files and scope the functions back to the order namespace.

#### Function $1$: Print the customer$$s menu.

Call this function $`$CustomerMenu$`.$ It should not return anything or take any parameters.

The customer menu should look like this:

$```$bash

$-----------------------------$

$--$ Straweberry Booth Menu $---$

$-----------------------------$

Please choose from the following options:

$1.$ Fresh Strawberries $$2\mathrm{.}99$

$2.$ Strawberry Jam $$4\mathrm{.}99$

$3.$ Glazed Strawberry Scone $$2\mathrm{.}00$

$4.$ Chocolate Covered Strawberry $$0\mathrm{.}50$

$```$

$\_$Hint: Use the $`/$t$`$ character to get even spacing upon output$\_$

#### Function $2$: Calculate price with tax

$\_$Function Setup$\_$

$-$ Named $`$CalculateTax$`.$

$-$ Returns a double

$-$ Accepts two parameters.

$-$ The first parameter is a double and represent the price of a product.

$-$ The second parameter is a double and will represent the tax rate.

This parameter should have a default value of $\mathrm{.}061\_($notice this is the value from our constant called NORMAL$\_$RATE$)\_.$

$\_$Function Task$\_$

$-$ Calculate the tax based on the price and rate

$-$ Add tax to initial price

$-$ return the final result

$**$Example$**$:

If the $`$price$`$ of an item were $$1\mathrm{.}99$ and the tax $`$rate$`$ for that item were $6\mathrm{.}10\%.$ Then the function would first calculate the tax for the item: $$\mathrm{.}12.$

Then add that tax to the price, making it $$2\mathrm{.}11$

#### Function $3$: Calculate price based on quantity

$\_$Function Setup$\_$

$*$ Named $`$CalculatePrice$`.$

$*$ Returns a double

$*$ Accepts two parameters

$*$ The first parameter is a double and represents the price of the item

$*$ The second parameter is a double and represents the quantity of items

$\_$Function Task$\_$

$*$ Calculate the price of the item based on it's quantity

$**$Example$**$:

If the $`$price$`$ of the item is $$2\mathrm{.}11$ and the user would like a $`$quantity$`$ value of $3,$ the total for that item would be $$6\mathrm{.}33.$

#### Function $4$: Update the total

$\_$Function Setup$\_$

$*$ Named UpdateTotal

$*$ Returns nothing

$*$ Accepts two parameters

$*$ The first parameter is a double and represents the new value to be added to the total

$*$ The second parameter is a double and is a reference to the total variable. This variable keeps track of the customer's running total.

$\_$Function Task$\_$

$*$ Update the passed in variable that is managing the customer's final $`$total$`.$

$**$Example:$**$

If the $`$total$`$ variable originally held the value of $$12\mathrm{.}99,$ but the customer added a new amount of $$6\mathrm{.}33$ to their order, this function would update the $`$total$`$ value to $$19\mathrm{.}32.$

## Customer Order Flow

The customer's order flow will be handled in the $`$main$.$cpp$`$ file.

It should use the functions from the $`$order$`$ namespace to calculate and present the final order total to the cashier.

### Main.cpp

Create the flow of the customer's order in $`$main$.$cpp$`$ by doing the following.

$1.$ Print the menu

$2.$ Get the user$$s choice using the numbers from the menu $(\_$ex: $1$ is for strawberries, etc$\_)$

$3.$ Use a switch statement to:

$*$ Calculate the product$$s price with tax $(\_$remember the business rules described in the introduction$\_)$

$*$ Get user$$s choice of item quantity

$```$bash

For strawberries ask $"$