/* Background: You have just opened a small business named “Cool Choices” selling 4 items. Create a menu of choices:

  1 Vanilla cone        - $1.35
  2 Lemonade            - $2.25
  3 Bubblegum slush     - $3.15
  4 Yogurt breeze       - $4.05

Your program should display the menu of 4 choices. Allow user input for the choice and validate that the user has entered a correct choice. Prompt the user to enter the quantity for this choice and validate that this is a positive number. Calculate the price which includes a sales tax of 8.25%. Display a sales receipt that includes the choice, the price for a single item, the quantity for this item, the total item cost (without tax), the total tax, the total price (including tax) and a “Thanks for your business” type message.

Develop functions to perform the tasks. Suggestions for function prototypes:
void DisplayMenu();
int GetChoice();
int GetNumberOfItems(int itemChoice);
double CalculateTotalItemCost(int itemChoice, int numItems);
double CalculateSalesTax(double totalItemCost);
void CreateSalesReceipt(int itemChoice, int numItems,
                        double totalItemCost, double totalTax,
                        double totalPrice);

Use global constants for the tax rate and the 4 price choices.

Each function definition should include the following documentation:
  Purpose:
  Pre-Condition:
  Post-Condition:

For example:
int GetNumberOfItems(int itemChoice)
//Purpose:        To return the quantity that the customer wants to purchase.
//Pre-Condition:  User has selected one menu item.
//Post-Condition: Returns the quantity that the customer wants to purchase
//                of the item selected from the menu.
{
   //declare local variables, if necessary
   int quantity;               //select the quantity for this itemChoice
     . . .
   return quantity;
}

*/

// o also think i need to code for it to output to file, which i bet i can code, just gotta look at notes that filestream bullshit of.stream(fag.txt
 // ios:app)

my code;


#include <iostream>    //cin, cout
#include <iomanip>     //setw, setprecision
using namespace std;





void DisplayMenu(void);
void GetChoice(int *);
void GetNumberOfItems(int *);
void CalculateTotalItemCost(int, int, double * );
void CalculateSalesTax(double, double * );
void CreateSalesReceipt(int , int , double, double);


int main (void)
{


 int choice, quantity;
 double rate, cost, total, totaltax;

     cout << fixed << showpoint << setprecision(2);

DisplayMenu ();

GetChoice (&choice);
GetNumberOfItems (&quantity);
CalculateTotalItemCost(choice, quantity, &cost);
CalculateSalesTax(cost, &totaltax);
CreateSalesReceipt(choice, quantity, cost, totaltax);
return 0;
}




void DisplayMenu (void)

{
     cout << "PLEASE CHOOSE ONE OF THE FOLLOWING: \n\n" ;
     cout << "1. Vanilla Cone    - $1.35\n" ;
     cout << "2. Lemonade        - $2.25\n" ;
     cout << "3. Bubblegum Slush - $3.15\n" ;
     cout << "4. Yogurt Breeze   - $4.05\n" ;
}

void GetChoice (int *choicePtr)

{
     cout << "Please Enter Choice: " ;
     cin >> *choicePtr;

     while ((*choicePtr < 1)) || (*choicePtr > 4 ))
 {
 cout << "Invalid Option.\n Please enter choice" ;
 cin >> *choicePtr;

 }

}


void GetNumberOfItems (int *quantityPtr)

{
    cout << "\nPLEASE ENTER # OF ITEMS: ";
    cin >> *quantityPtr;
    while (*quantityPtr < 1){
        //It said we needed verification,
    cout << "\n invalid selection. Please enter # of items:";
    cin >> *quantityPtr;
}




void CalculateTotalItemCost (int choice, int quantity, double *cost)
double cost = 0;
{
       if (choice = 1)
       {
             *cost = 1.35 * quantity ;
       }

       if (choice = 2)
       {
             *cost = 2.25 * quantity ;
       }

       if (choice = 3)
       {
             *cost = 3.15 * quantity ;
       }

       if (choice = 4)
       {
             *cost = 4.05 * quantity ;
       }
}



void CalculateSalesTax(double cost, double *tax){
*tax = cost * .0825;
}

void CreateSalesReceipt(int item, int quantity, double cost, double tax){
cout << "\n\nSALES RECIEPT\n";
cout << "ITEM: ";
if (item == 1) {
    cout << "Vanilla Cone\n";}
if else (item == 2) {
    cout << "Lemonade\n";}
if else (item == 3) {
    cout << "Bubble Gum Slush\n";}
else {
    cout << "Yogurt Breeze\n";}
cout << "QUANTITY: "<< quantity ;
cout << "\nPRICE WITHOUT TAX: " << cost ;
cout << "\n\nTAX: " << tax;
cout << "\n-----------------------";
cout << "\nTOTAL: "<< (cost + tax);
}