problème dans l'affichage dans un fichier

  void calcultfidf( const std::string& filename,const std::string folder)
{  std::multiset<std::string>::const_iterator iter;
   std::ofstream ofs ("tfidf.txt");
   std::multiset<std::string> liste;
   DIR* rep = opendir(folder.c_str());
   std::map<std::string, int> map;
  fillMap(map, filename);
  int nbtotal=0;
  int nbfic=0;
  int som = 0;
  float idf;
  float tf;
  typedef std::map<std::string, int>::const_iterator iter3;
  for (iter3 it = map.begin(); it != map.end(); ++it)
	som += it->second;

  std::cout << "Les tfidf du document " << filename <<std::endl<<std::endl;
  for (iter3 it = map.begin(); it != map.end(); ++it)
	{if (som !=0)
	   {
		 tf= (float)it->second / som;
		 std::cout << "* tf du mot " << it->first << " est " << tf << std::endl;
	   }

	   if (rep)
		{
		  struct dirent* lecture;

		  while ((lecture = readdir(rep)))
			{
			  nbtotal++;
			  if (!isValid(lecture->d_name))
				  continue;
			  std::string filename = lecture->d_name;
			  fillSet (liste, folder + "/" + filename);
			}


		  for (iter=liste.begin(); iter!=liste.end(); iter++)
			{
			  if (it->first == *iter)
				 nbfic++;
			}
		}
		closedir(rep);

		if (nbfic == 0)
		   idf = 0;

		else
		   idf = log(((float) nbtotal-2) / nbfic);

		   std::cout<< "* tfidf du mot " << it->first << " est " << tf * idf<<std::endl<<std::endl<<std::endl;
		   nbfic=0;

	}

}

  	int main()
{  static const std::string folder = "in";

   DIR* rep1 = opendir(folder.c_str());
  if (rep1)
  {  struct dirent* lecture1;

  while ((lecture1 = readdir(rep1)))
	{
	  if (!isValid(lecture1->d_name))
	continue;

		calcultfidf (folder + "/" + lecture1->d_name, folder);
	 }
	closedir(rep1);

  }
 system("pause");
return (0);
}