// This program writes data to a file, closes the file,
// then reopens the file and appends more data.
#include <iostream>
#include <fstream>
using namespace std;

int main()
{
   ofstream dataFile;
      
   cout << "Opening file...\n";
   // Open the file in output mode.
   dataFile.open("demofile.txt", ios::out);
   cout << "Now writing data to the file.\n";
   dataFile << "Jones\n";                     // Write line 1
   dataFile << "Smith\n";                     // Write line 2
   cout << "Now closing the file.\n";
   dataFile.close();                          // Close the file

   cout << "Opening the file again...\n";
   // Open the file in append mode.
   dataFile.open("demofile.txt", ios::out | ios::app);
   cout << "Writing more data to the file.\n";
   dataFile << "Willis\n";                    // Write line 3
   dataFile << "Davis\n";                     // Write line 4
   cout << "Now closing the file.\n";
   dataFile.close();                          // Close the file

   cout << "Done.\n";
   return 0;
}