public void Restore(string n1, string n2, char?op)
{
result.Set(n1);
operand.Set(n2);
previousOperator = op;
currentOperandDisplayed = result;
}
public Calculator()
{
resultState = new ResultState();
operandState = new OperandState();
operatorValue = null;
currentState = resultState;
stableState = operandState;
}
public Calculator()
{
// Display 0 initially
Console.WriteLine("0");
result = new OperandState();
operand = new OperandState();
currentOperandDisplayed = result;
}
public void SwitchNumbersBeingDisplayed()
{
if (currentOperandDisplayed == result)
{
currentOperandDisplayed = operand;
}
else
{
currentOperandDisplayed = result;
}
}
public string GetResultOrError(float num1, float num2, char?currentOperator)
{
var result = OperandState.GetResult(num1, num2, (char)previousOperator);
if (result == "error")
{
Restore("", "", null);
return(OperandState.Error);
}
Restore(result, "", currentOperator);
// If current operator is not '=', set to modify number 2
if (currentOperator != null)
{
SwitchNumbersBeingDisplayed();
}
return(this.result.content);
}
