using uCalcSoftware; var uc = new uCalc(); uc.DefineOperator("{a As Bool} ## {b As Bool} As Bool = a And b", uc.ItemOf("And").Precedence); Console.WriteLine(uc.EvalStr("true Or false ## 2 > 5")); uc.ItemOf("##").SetPrecedence(uc.ItemOf("Or").Precedence); Console.WriteLine(uc.EvalStr("true Or false ## 2 > 5"));