my bad had brain fart when writing the mode

this is the format for .open function call,
your_fstream_object.open( const char* szName, int nMode, int nProt = filebuf::openprot );

You can also open a file by calling the constructor, to check out all the specifics of fstream goto www.msdn.com ; type fstream::fstream in the search

#include <fstream> //dont forget to #include header file
using namespace std;

int main () {

  fstream filestr;

  // open somefile with append mode and default protection
  // Note if file does not reside in same file as sorce code you must specify the full path and name
 filestr.open("somefile.txt", ios::app);

  // >> i/o operations here <<

  filestr.close();

  return 0;
}