void ApplyToCurrentValue(string s)
{
if (currentValue == null)
{
currentValue = new Value();
valueStack.Push(currentValue);
}
currentValue.apply(s);
}
void PopOperatorAndCalculate()
{
if (operatorStack.Count > 0 && valueStack.Count > 1)
{
var op = operatorStack.Pop();
var right = valueStack.Pop();
var left = valueStack.Pop();
var result = op.Operate(left, right);
var value = new Value();
value.apply(result.ToString());
valueStack.Push(value);
}
}
public void Input(string expression)
{
if (expression.Equals("C"))
{
currentValue = null;
}
else
{
if (currentValue == null)
{
currentValue = new Value();
}
currentValue.apply(expression);
}
}