int pdf() {

  gStyle->SetPadBorderMode(0);
  gStyle->SetCanvasBorderMode(0);

  TH1F *h1 = new TH1F("h1","h1",100,0,10);

  TCanvas *c1 = new TCanvas("c1","c1");
  c1->Divide(2,2);
  c1->cd(1);
  h1->Draw();
  c1->cd(2);
  h1->Draw();
  c1->cd(3);
  h1->Draw();

  c1->Print("c1.pdf(","pdf");
  c1->Print("c1.pdf","pdf");
  c1->Print("c1.pdf)","pdf");

}