public double Calculate()
{
foreach (string part in splitCommand)
{
double number;
if (Double.TryParse(part, out number))
{
AddToStack(number);
}
else
{
IOperation operation = new OperationFactory().Create(part);
double b = PopOffStack();
double a = PopOffStack();
AddToStack(operation.Calculate(a, b));
}
}
return(PopOffStack());
}