Hello, I have written this program in C++ that is supposed to create a food menu

Question

Hello,

I have written this program in C++ that is supposed to create a food menu and calculate the amount that is supposed to be paid as well as your change.The program as of now is working perfectly fine, but I would like some help on creating this program in functions. Below is the program that is supposed to be converted into function and I appreciate any kind of help in advance:

#include <iostream>

#include <iomanip>

#include <fstream>

#include <cstdlib>

using namespace std;

int main()

{

   ofstream oFile;

   int choice=0, quantity;

   double subtotal=0, tax=.1, total, change, amount;

   oFile.open("Rec.txt");

   cout << fixed << showpoint;

   cout << setprecision(2);

   oFile << "Taco Hut" << endl;

   oFile << "Keep Receipt for your records" << endl;

   oFile << "Items Purchased detailled below" << endl;

   oFile << "**********************************" << endl;

   while(choice!=4)

   {

       system("CLS");

       cout << "Welconme to Taco Hut!" << endl;

       cout << "May I take your order" << endl;

       cout << "1. Taco" << endl;

       cout << "2. Burrito" << endl;

       cout << "3. Coke" << endl;

       cout << "Subtotal: $" << subtotal << endl;

       cout << "Enter Selection (4 to Complete Sale): ";

       cin >> choice;

       if(choice!=4)

       {

           cout << "Quantity: ";

           cin >> quantity;

           if(choice==1)

           {

               subtotal=subtotal+(quantity*1.99);

               oFile << quantity << " Taco    @ 1.99 = $" << quantity * 1.99 << endl;

           }

           if(choice==2)

           {

               subtotal=subtotal+(quantity*2.99);

               oFile << quantity << " Burrito @ 2.99 = $" << quantity * 2.99 << endl;

           }

           if(choice==3)

           {

               subtotal=subtotal+(quantity*1.50);

               oFile << quantity << " Coke    @ 1.50 = $" << quantity * 1.50 << endl;

           }

       }

   }

   oFile << "**********************************" << endl;

   cout << "Subtotal: $" << subtotal << endl;

   oFile << "Subtotal: $" << subtotal << endl;

   cout << "Tax: $" << tax*subtotal << endl;

   oFile << "Tax: $" << tax*subtotal << endl;

   total = subtotal + (subtotal*tax);

   cout << "Total: $" << total << endl << endl;

   oFile << "Total: $" << total << endl << endl;

   cout << "Enter Amount Paid: $";

   cin >> amount;

   oFile << "Enter Amount Paid $" << amount << endl;

   change = amount - total;

   cout << "Your Change is: $" << change << endl << endl;

   oFile << "Your Change is: $" << change << endl << endl;

   cout << "Thank You! Come Again!" << endl;

   oFile << "Thank You! Come Again!";

   oFile.close();

   system("pause");

   return 0;

}

Explanation / Answer

#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstdlib>
using namespace std;
void taco(int quantity,double &subtotal,ofstream &oFile)
{

subtotal=subtotal+(quantity*1.99);
oFile << quantity << " Taco @ 1.99 = $" << quantity * 1.99 << endl;
}
void burrito(int quantity,double &subtotal,ofstream &oFile)
{
subtotal=subtotal+(quantity*2.99);
oFile << quantity << " Burrito @ 2.99 = $" << quantity * 2.99 << endl;
}

void coke(int quantity,double &subtotal,ofstream &oFile)
{
subtotal=subtotal+(quantity*1.50);
oFile << quantity << " Coke @ 1.50 = $" << quantity * 1.50 << endl;
}

int main()
{
ofstream oFile;
int choice=0, quantity;
double subtotal=0, tax=.1, total, change, amount;

oFile.open("Rec.txt");

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

oFile << "Taco Hut" << endl;
oFile << "Keep Receipt for your records" << endl;
oFile << "Items Purchased detailled below" << endl;
oFile << "**********************************" << endl;

while(choice!=4)
{
system("CLS");
cout << "Welconme to Taco Hut!" << endl;
cout << "May I take your order" << endl;

cout << "1. Taco" << endl;
cout << "2. Burrito" << endl;
cout << "3. Coke" << endl;
cout << "Subtotal: $" << subtotal << endl;
cout << "Enter Selection (4 to Complete Sale): ";
cin >> choice;

if(choice!=4)
{
cout << "Quantity: ";
cin >> quantity;

if(choice==1)
{
taco(quantity,subtotal,oFile);
}
if(choice==2)
{
burrito(quantity,subtotal,oFile);
}
if(choice==3)
{
coke(quantity,subtotal,oFile);
}
}
}

oFile << "**********************************" << endl;

cout << "Subtotal: $" << subtotal << endl;
oFile << "Subtotal: $" << subtotal << endl;

cout << "Tax: $" << tax*subtotal << endl;
oFile << "Tax: $" << tax*subtotal << endl;

total = subtotal + (subtotal*tax);
cout << "Total: $" << total << endl << endl;
oFile << "Total: $" << total << endl << endl;

cout << "Enter Amount Paid: $";
cin >> amount;
oFile << "Enter Amount Paid $" << amount << endl;

change = amount - total;
cout << "Your Change is: $" << change << endl << endl;
oFile << "Your Change is: $" << change << endl << endl;

cout << "Thank You! Come Again!" << endl;
oFile << "Thank You! Come Again!";

oFile.close();

system("pause");
return 0;
}

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