TCanvas *nut = new TCanvas("nut", "FirstSession",100,10,700,900);
nut->Range(0,0,20,24);
nut->SetFillColor(10);
nut->SetBorderSize(2);

TPaveLabel *pl = new TPaveLabel(3,22,17,23.7,
   "My first ROOT interactive session","br");
pl->SetFillColor(18);
pl->Draw();

TText t(0,0,"a");
t.SetTextFont(62);
t.SetTextSize(0.025);
t.SetTextAlign(12);
t.DrawText(2,20.3,"ROOT is based on CLING, a powerful C/C++ interpreter.");
t.DrawText(2,19.3,"Blocks of lines can be entered within {...}.");
t.DrawText(2,18.3,"Previous typed lines can be recalled.");

t.SetTextFont(72);
t.SetTextSize(0.026);
t.DrawText(3,17,"Root >  float x=5; float y=7;");
t.DrawText(3,16,"Root >  x*sqrt(y)");
t.DrawText(3,14,
   "Root >  for (int i=2;i<7;i++) printf(\"sqrt(%d) = %f\\n\",i,sqrt(i));");
t.DrawText(3,10,"Root >  TF1 f1(\"f1\",\"sin(x)/x\",0,10)");
t.DrawText(3, 9,"Root >  f1.Draw()");
t.SetTextFont(81);
t.SetTextSize(0.018);
t.DrawText(4,15,"(float) 13.2288f");
t.DrawText(4,13.3,"sqrt(2) = 1.414214");
t.DrawText(4,12.7,"sqrt(3) = 1.732051");
t.DrawText(4,12.1,"sqrt(4) = 2.000000");
t.DrawText(4,11.5,"sqrt(5) = 2.236068");
t.DrawText(4,10.9,"sqrt(6) = 2.449490");

TPad *pad = new TPad("pad","pad",.2,.05,.8,.35);
pad->Draw();
pad->cd();
pad->SetGrid();
TF1 *f1 = new TF1("f1","sin(x)/x",0,10);
f1->Draw();

%jsroot on
gROOT->GetListOfCanvases()->Draw()