// root macro
//
{
  TH1F * h4 = new TH1F("h4","Daten",10,0,10);
  ifstream inp;
  inp.open("daten.dat");
  double x;
  while ( !(inp >> x ) == 0 ) {
    cout << x << endl;
    h4->Fill( x-0.5 );
  }
  h4->Draw();
}