//In this tutorial, we create multiple root files, and then use a TChain object to link them into a "single tree"
#include <iostream>

using namespace std;


void treechain(){
	TFile* f = TFile::Open("file.root","RECREATE");
	TTree* t = new TTree("t","a simple tree");
	
	t->SetMaxTreeSize(5);                     //size of 500 bytes
		
	Int_t data_A, data_B, data_C;

	t->Branch("dA",&data_A,"data_A/I");
	t->Branch("dB",&data_B,"data_B/I");
	t->Branch("dC",&data_C,"data_C/I");
	
	for (Int_t i = 0; i<5;i++){
		data_A = 10;
		data_B = 30;
		data_C = 60;
		t->Fill();
	}
	
	
	t->Write();
	gROOT->ProcessLine(".!ls -lthr");

	
	//Declare a chain 
	
	/* TChain chain("t");                    																																									//Remember that the tree in our root files is called t. Since TChain is derived from TTree, we need t in the argument here. 
	chain.Add("file.root");
	chain.Add("file_1.root");
	chain.Add("file_2.root");
	
	chain.Print(); */
	
	
	
	
	
	
}