C++ Program for Accessing Data in a File

#include <algorithm>
   #include <cstdlib>
   #include <fstream>
   #include <functional>
   #include <iostream>
   #include <iterator>
   #include <vector>
   using namespace std;
   template <class T>
   void print(T & c)
   {
     for( typename T::iterator i = c.begin(); i != c.end(); i++ )
     {
       std::cout << *i << endl;
     }
   }
   int main()
   {
     vector <int> output_data( 10 );
     generate( output_data.begin(), output_data.end(), rand );
     transform( output_data.begin(), output_data.end(),output_data.begin(), bind2nd( modulus<int>(), 10 ) );
     ofstream out( "data.txt" );
     if( !out )
     {
       cout << "Couldn't open output file\n";
       return 0;
     }
     copy( output_data.begin(), output_data.end(),ostream_iterator<int>( out, "\n" ) );
     out.close();
     ifstream in( "data.txt" );
     if( !in )
     {
       cout << "Couldn't open input file\n";
       return 0;
     }
     vector<int> input_data( (istream_iterator<int>( in )),istream_iterator<int>() );
     in.close();
     print( output_data );
     print( input_data );
   }