public override int Evaluate(EvaluateOption option, Calculator calculator)
{
VerifyEvaluationState();
int result = 0;
switch (option)
{
case EvaluateOption.UIEvaluate:
calculator.Clear();
int leftValue = Left.Evaluate(option, calculator);
calculator.Clear();
int rightValue = Right.Evaluate(option, calculator);
calculator.Clear();
calculator.Result = leftValue;
InvokeOperator(calculator);
calculator.Result = rightValue;
calculator.Evaluate();
result = int.Parse(calculator.Result.ToString());
break;
case EvaluateOption.ActualEvaluate:
result = Evaluate(Left.Evaluate(option, calculator), Right.Evaluate(option, calculator));
break;
}
return(result);
}
public override int Evaluate(EvaluateOption option, Calculator calculator)
{
if (Operand == null)
{
throw new InvalidOperationException();
}
int result = 0;
switch (option)
{
case EvaluateOption.UIEvaluate:
calculator.Clear();
int operandEval = Operand.Evaluate(option, calculator);
calculator.Clear();
calculator.Result = operandEval;
InvokeOperator(calculator);
calculator.Evaluate();
result = int.Parse(calculator.Result.ToString());
break;
case EvaluateOption.ActualEvaluate:
result = Evaluate(Operand.Evaluate(option, calculator));
break;
}
return(result);
}
public abstract int Evaluate(EvaluateOption option, Calculator calculator);
public override int Evaluate(EvaluateOption option, Calculator calculator)
{
return(_number);
}