Notes

void ttree_bank_array()
{
TFile* hfile = TFile::Open("money_array.root","RECREATE");
TTree* t = new TTree("savings","Bank Accounts");
/* suppose there are two brothers, Ali and Cem Ali has 2 bank accounts Cem has 3 bank account3 */
//Initilisation: let's declare 2 arrays with 2 elements for Ali 3 elements for Cem
Int_t Ali_account[2]={0};//initilisation, {0} means all elements are zero
Int_t Cem_account[3]={0};
/*let's create a branch, and a leaf to store the array
branch "Fizbank", link to array Ali_account, with one leaf "bank" .*/
//Events->Tree Name, Event Tree->Tree Tıtle
Int_t money1, money2, money3;
t->Branch("Fizbank",Ali_account, "bankAli[2]/I");//there is no address operator("&"(ampersand))
infront of the array name, because array takes the first address according to c++ language
t->Branch("Matbank",Cem_account, "bankCem[3]/I");
Ali_account[0]=25; Ali_account[1]=90;
Cem_account[0]=10;Cem_account[1]=20; Cem_account[2]=30;
t->Fill();
Ali_account[0]=5; Ali_account[1]=10;
Cem_account[0]=3; Cem_account[1]=30; Cem_account[2]=300;
t->Write();
hfile->Close();
}