#include <TH1.h>
#include <TF1.h>
#include <TCanvas.h>
#include <TRandom3.h>

#ifndef __CINT__
#include <TApplication.h>
void drawGauss();

int main(int argc, char* argv[]) 
{
   TApplication app("CanvasClose", &argc, argv);

   drawGauss();

   app.Run();

   return 0;
}
#endif

void drawGauss()
{

   TH1D* histogram = new TH1D("Histogram", "Histogram containing gaus", 40, -5, 5);

   TF1* f1 = new TF1("f1", "gaus(0)", -5, 5);
   f1->SetParameter(0, 1);
   f1->SetParameter(1, 0);
   f1->SetParameter(2, 1);   

   for (UInt_t i = 0; i < 10000; i++) {
      Double_t random = f1->GetRandom();
      histogram->Fill(random);
   }
   
   TCanvas* canv = new TCanvas("Canvas", "Canvas", 400, 400);
   canv->cd(1);
   histogram->Draw();

}