// This program uses the write and read functions.
#include <iostream>
#include <fstream>
using namespace std;

int main()
{
   const int SIZE = 4;
   char data[SIZE] = {'A', 'B', 'C', 'D'};
   fstream file;

   // Open the file for output in binary mode.
   file.open("test.dat", ios::out | ios::binary);

   // Write the contents of the array to the file.
   cout << "Writing the characters to the file.\n";
   file.write(data, sizeof(data));

   // Close the file.
   file.close();

   // Open the file for input in binary mode.
   file.open("test.dat", ios::in | ios::binary);

   // Read the contents of the file into the array.
   cout << "Now reading the data back into memory.\n";
   file.read(data, sizeof(data));

   // Display the contents of the array.
   for (int count = 0; count < SIZE; count++)
      cout << data[count] << " ";
   cout << endl;

   // Close the file.
   file.close();
   return 0;
}