NumberElement calculate(NumberElement left, NumberElement right, OperatorElement op)
{
Double temp = Double.MaxValue;
if (op.type == OperatorType.ADD)
{
temp = left.getNumber() + right.getNumber();
}
else if (op.type == OperatorType.SUBTRACT)
{
temp = left.getNumber() - right.getNumber();
}
else if (op.type == OperatorType.MULTIPLY)
{
temp = left.getNumber() * right.getNumber();
}
else if (op.type == OperatorType.DIVIDE)
{
temp = left.getNumber() / right.getNumber();
}
else if (op.type == OperatorType.EXPONENTIAL)
{
temp = Math.Pow(left.getNumber(), right.getNumber());
}
return(new NumberElement(temp.ToString()));
}
public Double Evaluate(List <Element> e)
{
List <Element> v = new List <Element>(e);
for (int i = 0; i < v.Count; i++)
{
Element element = v[i];
if (element.GetType().Equals(typeof(NumberElement)))
{
stack.Push(element);
}
if (element.GetType().Equals(typeof(OperatorElement)))
{
NumberElement right = (NumberElement)stack.Pop();
NumberElement left = (NumberElement)stack.Pop();
NumberElement result = calculate(left, right, (OperatorElement)element);
stack.Push(result);
}
}
return(((NumberElement)stack.Pop()).getNumber());
}
