public CalculatorPortable(IButton [] buttons, IButton [] operators, IResultText resultTxt, IResultText secondTxt)
 {
     _buttons   = buttons;
     _operators = operators;
     AddNumbersListeners();
     AddOperatorsListeners();
     _mainText   = resultTxt;
     _secondText = secondTxt;
     tedt();
 }
 private void SetText(IResultText textField, decimal number)
 {
 }
 private void SetText(IResultText textField, decimal number, string oper)
 {
     textField.TextContent = number.ToString() + oper;
 }
 private decimal NumberParser(IResultText T)
 {
     return(decimal.Parse(T.TextContent));
 }