public override ICalculator numericButtonPressed(int button) { if (ScreenText.Length < maxDigitsOnScreen) { if (ScreenText.Equals("0")) { ScreenValue = button; } else { ScreenText = ScreenText + button; } } return(new ScreenViewCalculatorState(AccumulatorValue, ScreenText, calculatorOperator, maxDigitsOnScreen)); }
public override ICalculator invertSignButtonPressed() { log.Debug("Wcisnieto przycisk odwrocenia znaku "); String newScreenValue = "?"; if (ScreenText.StartsWith("-")) { newScreenValue = ScreenText.Substring(1); } else if (!ScreenText.Equals("0")) { newScreenValue = '-' + ScreenText; } else { newScreenValue = ScreenText; } return(new ScreenViewCalculatorState(AccumulatorValue, newScreenValue, calculatorOperator, maxDigitsOnScreen)); }