{

TCanvas *c=new TCanvas("FormatText","FormatText",500,500);

c->Divide(2,2);

Float_t Pi=3.1416;
TH2D *hist=new TH2D("one","one",1,0.0,1.0, 1,0.0,1.0);
hist->SetBinContent(1,1,Pi);
hist->SetMarkerSize(3);

c->cd(1);
gStyle->SetPaintTextFormat(".3f");
hist->Draw("TEXT");
//gPad->SetBit(kcannotPick);
gPad->SetEditable(false);
gPad->Update();



c->cd(2);
gStyle->SetPaintTextFormat(".2f");
hist->Draw("TEXT");
gPad->Update();


c->cd(3);
gStyle->SetPaintTextFormat(".1f");
hist->Draw("TEXT");
gPad->Update();



c->cd(4);
gStyle->SetPaintTextFormat(".0f");
hist->Draw("TEXT");
gPad->Update();

}