private void AddOperatorElement(Element element)
        {
            float builtNumber = NumberBuilder.BuildNumber();

            CalculatorModel.AddNumberToCalculation(builtNumber);
            CalculatorModel.AddOperatorToCalculation(ElementEvaluator.EvaluateElement(element));
            ShowNumber(builtNumber);
            NumberBuilder.NewNumber();
        }
        private void DoOperation()
        {
            float mostRecentNumber = CalculatorModel.MostRecentNumber;
            float builtNumber      = NumberBuilder.BuildNumber();

            CalculatorModel.AddNumberToCalculation(builtNumber);
            if (CalculatorModel.AmountOfNumbers == 1 && CalculatorModel.AmountOfOperators == 0)
            {
                CalculatorModel.AddOperatorToCalculation(CalculatorModel.MostRecentOperator);
                CalculatorModel.AddNumberToCalculation(mostRecentNumber);
            }
            NumberBuilder.NewNumber();
            ShowResult();
        }