//how to create a root file and store data on it

void TFileCreate()
{
	TFile *filename = new TFile("filename.root", "RECREATE");
	TTree *treename = new TTree("treename", "treetitle");

	TH1F *histname = new TH1F("histname", "histtitle", 100, 0, 10);
	histname->FillRandom("gaus",1000);
	histname->Draw();

	filename->Write();
	filename->Close();

}

//everything betwee line 5 and line 12 are stored in the roofile tree. 
//You can use new TBrowser to view the inside