#include <TFile.h>
#include <TTree.h>

void pedestal()
{
    const char* pedestal00 = "pedestal00.root";
    const char* subtractped = "subtractped.root";
    
    TFile* inputFile = new TFile("pedestal00.root", "READ");
    TFile* outputFile = new TFile("subtractped.root", "RECREATE");
   
    TTree* inputTree = (TTree*)inputFile->Get("tree");
    TTree* outputTree = inputTree->CloneTree(0);

   
    Double_t inputBranch;  /
    TBranch* inputBranchPtr = inputTree->GetBranch("x3");
    TBranch* outputBranchPtr = outputTree->Branch("x33", &inputBranch);

    Double_t pedestalValue = 42.0;

    
    Long64_t nEntries = inputTree->GetEntries();
    for (Long64_t iEntry = 0; iEntry < nEntries; ++iEntry) {
        inputTree->GetEntry(iEntry);
        
        inputBranch -= pedestalValue;

        outputBranchPtr->Fill();
        outputTree->Fill();
    }
    outputFile->Write();
    cout << "Entries: " << nEntries << endl;
   
    inputFile->Close();
    outputFile->Close();

    printf("Pedestal subtraction completed. Output saved to %s\n", "subtractped.root");
}