text: public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval numberVE){int number;try{number = OperandResolver.CoerceValueToInt(numberVE);}catch (EvaluationException){return ErrorEval.VALUE_INVALID;}if (number < 0){return ErrorEval.NUM_ERROR;}return new NumberEval(factorial(number).LongValue());}