// This program lets the user enter a filename.
// and reads in a list of purchases and finds the total and the average purchase
// This is program 5-24 modified by CYC
#include <iostream>
#include <string>       // in order to accept a file name from the user
#include <fstream>      // in order to process files
#include <iomanip>

using namespace std;

int main()
{
   ifstream inputFile;   //input file name
   string filename;
   double number;        //grocery item price
   double average;       //average purchase price for one visit
   double total=0;       //total purchases for one visit
   int count =0;         //number purchases at one visit to store

   // Get the filename from the user.

   cout << "Enter the filename: ";
   cin >> filename;      //I am testing the program using a file called datalist.txt

   // Open the file.
   inputFile.open(filename);
   // If the file successfully opens, process it else write out error message and quit
   if (inputFile)
   {
      // Read the numbers from the file and
      // display them in order to track if file is being read correctly
      inputFile >> number;              //input the first number in the data file
      cout << setprecision(2) << fixed;
      while ( number > 0)
      {
         count++;
         total +=number;
         cout << number << endl;
         inputFile >> number;           //input the next number
      }
      average = total/count;
      cout << "\nFor a total of " << count << " items "
           << "your average purchase price is " << average << endl;

      // Close the file.
      inputFile.close();
   }
   else
   {
	   // Display an error message.
	   cout << "Error opening the file.\n";
   }
   return 0;
}