#include <iostream>
#include <vector>
#include "TH1F.h"
#include "TCanvas.h"
#include "TStyle.h"
#include "TMath.h"
#include "TROOT.h"
#include <stdlib.h>
#include <string>
#include <sstream>
#include <time.h>
#include "TFile.h"
#include "TRandom.h"

class Common_Data {
 public:

  Int_t a1;
  Float_t b1; 
 
  TH1F **histo1;
 
};

Common_Data *my_class = new Common_Data;


void DoSomething(){

     int a2=100;
     float b2=100.11;

     TH1F *histo[3];
     histo[0] = new TH1F("h1","h1",100,-1.0,1.0);
     histo[1] = new TH1F("h1","h1",100,-1.0,1.0);
     histo[2] = new TH1F("h1","h1",100,-1.0,1.0);

     for(int i=0;i<100000;i++){
      histo[0]->Fill(gRandom->Gaus(-1,1.5));
      histo[1]->Fill(gRandom->Gaus(-1,1.5));
      histo[2]->Fill(gRandom->Gaus(-1,1.5));
     }

     my_class->a1=a2;
     my_class->b1=b2;
     my_class->histo1=histo;

     cout << " " << a2 << "  " << b2 << "  " << histo[0]-> GetMean() ;
     cout << "  " << histo[1]-> GetMean() << "  " << histo[2]-> GetMean() << endl;
}
     

void Save_data(){

  cout << my_class->a1 << "  " << my_class->b1 << endl;

  TFile *my_own_file =new TFile ("histo.root", "RECREATE");
  my_own_file->cd();
  for (int i= 0;i<3;i++) { 
    cout << " " << i << " " << my_class->histo1[i]->GetMean() << endl;
    my_class->histo1[i]->Write();
  }
  my_own_file->Close();
    
}