How to add histograms

ROOT
26

I am trying to use
void TH1::Add(const TH1 *M_LQ1, const TH1 *M_LQ2, Double_t c1, Double_t c2)

and I get:

./upload.Cxx: line 1: syntax blunders close to surprising token (’ ./upload.Cxx: line 1:void TH1::Add(const TH1 *M_LQ1, const TH1 *M_LQ2, Double_t c1, Double_t c2)’

upload.Cxx is my record, it’s miles in my ~/public, if you may check:
/afs/cern.Ch/person/e/evgenia/public
Thanks.