Sample Program: File Output

//  This program reads the cost of items purchased and adds them up.
//  The program will stop reading when -1 is entered. The price of
//  each item and the total cost are printed to the file out.dat

#include <iostream.h>
#include <iomanip.h>
#include <fstream.h>

int main()
{
   const int SENTINEL = -1;
   float price;
   float total = 0;
   ofstream outfile;

//  open the output file and print heading
   outfile.open("out.dat");
   outfile << setiosflags(ios::fixed);
   outfile << setiosflags(ios::showpoint);
   outfile << setprecision(2);
   outfile << "Items Purchased:\n";

//  read in the price of each item, add to the total, and print
//  price in output file
   cout << "Enter the price of the first item (enter -1 to end): ";
   cin >> price;
   while (price != SENTINEL)
   {
      total = total + price;
      outfile << "      $" << price << endl;
      cout << "Enter the price of the next item (enter -1 to end): ";
      cin >> price;
   }

//  print the total cost in output file
   outfile << "Total Cost:\n      $" << total << endl;
}

Sample Execution: User Input

Enter the price of the first item (enter -1 to end): 2.5
Enter the price of the next item (enter -1 to end): 4.75
Enter the price of the next item (enter -1 to end): 9.95
Enter the price of the next item (enter -1 to end): 1.5
Enter the price of the next item (enter -1 to end): -1

Sample Execution: Contents of out.dat

Items Purchased:
      $2.50
      $4.75
      $9.95
      $1.50
Total Cost:
      $18.70

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