private void BuildStack(ref LIFO stack, string str)
{
if (IsNumber(str.ToString()) == true)
{
stack.Push(new Element(str));
}
else
{
stack.Push(MakeOperation(stack.Pop().Value, stack.Pop().Value, str.ToString()));
}
}
private double CalculateResult(string order)
{
LIFO stack = new LIFO();
if (IsNumber(order[0].ToString()) == true)
{
for (int i = 0; i < order.Length; i++)
{
BuildStack(ref stack, order[i].ToString());
}
}
else
{
for (int i = order.Length - 1; i >= 0; i--)
{
BuildStack(ref stack, order[i].ToString());
}
}
return(Convert.ToDouble(stack.Pop().Value));
}