Hi, can someone explain this behaviour: root [62] float sum=0. root [63] float s=0. root [64] for(int ll=1; ll<101; ll++){s=h02->GetBinContent(ll);sum=sum+s;}; root [65] sum (float)1.00000011920928955e+00 !!!!!!!!!!!!!!!!! root [66] sum=0. (const double)0.00000000000000000e+00 root [67] for(int ll=1; ll<101; ll++){sum+=h02->GetBinContent(ll);}; root [68] sum (float)3.94031524658203125e-01 ????????????????? The first answer is correct, the second is not, it's the content of the first bin. h02 is the name of some histogram. Using Root Version 3.01/06 13 September 2001 Cheers, Birger ------------------------------------------------------------ Birger Koblitz koblitz@mail.desy.de ("-/")_.-'"-._ MPI für Physik . . ; -._ )-;-,_) c/o DESY-FH1 Tel. (40) 8998-3971 (v_,)' _ )-.\ -' Notkestr. 85 _.- _..-_/ / ((.' D-22603 HAMBURG ((,.-' ((,/
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