#include "TFile.h"
#include "TTree.h"
#include "TBrowser.h"
#include "TH2.h"
#include "TRandom.h"
#include "TCanvas.h"
#include "TMath.h"

void NewTree()
{
  TFile hfile("Event.root","RECREATE");


  // Create a ROOT Tree

  TTree *tree = new TTree("T","An example of a ROOT tree");

  int EvtNumber;

  tree->Branch("EvtNumber", &EvtNumber, "EvtNumber/I");

  for (int evt = 0; evt < 1000; evt++) {
    EvtNumber = evt;
    tree->Fill();
  }
  tree->Write();
  hfile.Close();
}