// John Doe
// reading and writing files demo #1
// day of week??

#include <iostream>
#include <fstream>
using namespace std;

void displayMenu();                 // displays menu

// ******************* constant declaration statements *******
const double BOOK_PRICE = 9.00;     // price per book
const double MOVIE_PRICE = 13.97;   // price per movie

int main()
{
   // *************** variable declaration statements *******
   int numBooks = 0;                // # of books for this order
   int totalNumBooks = 0;           // total # of books ordered by customer
   int numMovies = 0;               // # of movies for this order
   int totalNumMovies = 0;          // total # of movies ordered by customer
   double bookSubtotal = 0.0;       // subtotal cost of books
   double movieSubtotal = 0.0;      // subtotal cost of books
   double grandTotal = 0.0;         // grandtotal of all purchases
   bool userWantsToExit = false;    // flag variable to exit while loop
   int menuChoice = 0;              // customer's menu choice
   ifstream infile("V:/Desktop/data.txt");    // file with input data (use forward slashes)
   ofstream outfile("V:/Desktop/output.txt");    // file for output

   while (!userWantsToExit)
   {	
        //displayMenu();
        infile >> menuChoice; 

        if (menuChoice == 1)
        {
            //cout << "Enter number of books: ";
            infile >> numBooks;

            if (numBooks >= 0 && numBooks <= 10)
            {
                totalNumBooks += numBooks;
            }
            else
            {
                //cout << "Invalid input." << endl;
            }

        }
        else if (menuChoice == 2)
        {
            //cout << "Enter number of movies: ";
            infile >> numMovies;

            if (numMovies >= 0 && numMovies <= 10)
            {
                totalNumMovies += numMovies;
            }
            else
            {
                //cout << "Invalid input." << endl;
            }
        }
        else if (menuChoice == 3)
        {
            userWantsToExit = true;	
        }
        else
        {
            //cout << "Invalid input." << endl;
        }

    }

    // *************** output display ************************
    bookSubtotal = totalNumBooks * BOOK_PRICE;
    movieSubtotal = totalNumMovies * MOVIE_PRICE;
    grandTotal = bookSubtotal + movieSubtotal;

    outfile << "\nYou owe $" << grandTotal << endl << endl;

    infile.close();
    outfile.close();
		
    system("pause");
    return 0;
}// end of main

// displays menu
void displayMenu()
{
    cout << "\n1 books" << endl;
    cout << "2 movies" << endl;
    cout << "3 checkout" << endl;
    cout << "Enter your choice: ";
}// end of displayMenu