public void DigitButtonPress(string button)
{
switch (button)
{
case "CLEAR":
{
Display = "0";
LeftOperand = string.Empty;
RightOperand = string.Empty;
Operation = string.Empty;
break;
}
case "BACKSPACE":
{
if (Operation != string.Empty && RightOperand == string.Empty)
{
Operation = string.Empty;
Display = LeftOperand;
}
else if (Operation != string.Empty && RightOperand != string.Empty)
{
RightOperand = RightOperand.Remove(RightOperand.Length - 1);
Display = LeftOperand + Operation + RightOperand;
}
else if (LeftOperand != string.Empty)
{
LeftOperand = LeftOperand.Remove(LeftOperand.Length - 1);
if (LeftOperand != string.Empty)
{
Display = LeftOperand;
}
else
{
Display = "0";
}
}
break;
}
default:
{
if (Operation == string.Empty)
{
LeftOperand = LeftOperand + button;
Display = LeftOperand;
}
else
{
RightOperand = RightOperand + button;
Display = LeftOperand + Operation + RightOperand;
}
break;
}
}
}