public void OperationButtonPress(string button)
{
if (LeftOperand != string.Empty)
{
switch (button)
{
case "+":
{
if (RightOperand != string.Empty)
{
_calculatorModel.CalculateResult();
Operation = "+";
LeftOperand = _calculatorModel.Result;
RightOperand = String.Empty;
}
else
{
Operation = "+";
}
Display = LeftOperand + Operation;
break;
}
case "-":
{
if (RightOperand != string.Empty)
{
_calculatorModel.CalculateResult();
Operation = "-";
LeftOperand = _calculatorModel.Result;
RightOperand = String.Empty;
}
else
{
Operation = "-";
}
Display = LeftOperand + Operation;
break;
}
case "*":
{
if (RightOperand != string.Empty)
{
_calculatorModel.CalculateResult();
Operation = "*";
LeftOperand = _calculatorModel.Result;
RightOperand = String.Empty;
}
else
{
Operation = "*";
}
Display = LeftOperand + Operation;
break;
}
case "/":
{
if (RightOperand != string.Empty)
{
_calculatorModel.CalculateResult();
Operation = "/";
LeftOperand = _calculatorModel.Result;
RightOperand = String.Empty;
}
else
{
Operation = "/";
}
Display = LeftOperand + Operation;
break;
}
case "=":
{
if (RightOperand != string.Empty)
{
_calculatorModel.CalculateResult();
Operation = string.Empty;
LeftOperand = _calculatorModel.Result;
RightOperand = String.Empty;
Display = LeftOperand;
}
break;
}
default:
throw new ArgumentException();
}
}
}
