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  1. ROOT
  2. ROOT-8110

TFormula in v6 performs integer division where it used to perform real division in v5

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: High
    • Resolution: Won't Fix
    • Affects Version/s: 6.06/02
    • Fix Version/s: None
    • Component/s: Math Libraries
    • Labels:
      None
    • Environment:

      Linux

    • Development:

      Description

      ROOT 5's TFormula used to interpret all literal numbers in its expression as double.
      The following line evaluated a "1.0/2.0*2.0" and returned "1.0":

      root.exe -l <<< 'cout << TFormula("F", "1/2*2").Eval(0.) << endl;'

      ROOT 6's TFormula seems to more strictly adhere to a C syntax, and the same line executes "1/2*2" and return "0.0".

      This is a serious compatibility break, very easy to be missed.
      Can the old behaviour be restored?

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            Assignee:
            moneta Lorenzo Moneta
            Reporter:
            f98957ffb41780c8d75c Gianluca Petrillo
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