private void button_MouseClick(object sender, EventArgs e) { String strLabelValue = ((Label)sender).Text; Char firstCharLabelValue = strLabelValue.ToCharArray()[0]; int labelNumValue = 0; if (int.TryParse(strLabelValue, out labelNumValue)) { if (labelNumValue >= 0 && labelNumValue <= 9) { calculator.addDisplayNumber(labelNumValue); } printDisplays(calculator.getDisplays()); return; } if (strLabelValue.Equals("CE")) { calculator.removeDisplayNumber(); printDisplays(calculator.getDisplays()); return; } switch (firstCharLabelValue) { case (char)Calculator.Symbols.REMOVE_LAST: calculator.removeLastDisplayNumber(); break; case (char)Calculator.Symbols.REMOVE_DISPLAY: calculator.removeDisplays(); break; case (char)Calculator.Symbols.PLUS_MINUS: calculator.toggleDisplayNumberSymbol(); break; case (char)Calculator.Symbols.COMMA: calculator.appendDisplayComma(); break; case (char)Calculator.Symbols.ADD: case (char)Calculator.Symbols.SUBSTRACT: case (char)Calculator.Symbols.MULTIPLY: case (char)Calculator.Symbols.DIVIDE: calculator.addOperator(firstCharLabelValue); break; case (char)Calculator.Symbols.EQUAL: calculator.calculateResult(); break; } printDisplays(calculator.getDisplays()); }