#include "TCanvas.h"
#include "TPad.h"
#include "TMultiGraph.h"
#include "TGraph.h"
#include "TGraphErrors.h"
#include "TAxis.h"
#include "TLegend.h"
#include "TLatex.h"
#include "TROOT.h"
#include <fstream>
#include <cstdlib> // for "exit"
void histo()
{
#if 1 /* 0 or 1 */
  const char *datain = "C:/dati.txt";
  const char *dataout = "C:/root_v6.20.00/histo.pdf";
#else /* 0 or 1 */
  const char *datain = "dati.txt";
  const char *dataout = "histo.pdf";
#endif /* 0 or 1 */
  
   TCanvas *c1 = new TCanvas("c1","Histogram",1280,1024);
   TH1F *h = new TH1F("h", "Histogram",10,25,35);
   ifstream inp; double x;
   inp.open(datain);
   for (int i=1; i<=50; i++) {
      inp >> x;
      h->SetBinContent(i,x);
   }
   h->Draw();
inp.close();
c1->Print(dataout);
 delete c1;
  //exit(0);
}