You cannot do that with the ZHD's calculator, so it calculates in the order of input.
Then it isn't a "scientific" calculator.
Math is a science. It has rules. There is a right and there is a wrong.
The order of operations is a rule.
Observing it is right. Not observing it is wrong.
If you have a calculator that works in order of input only then it is not a scientific calculator.
If you have one that calls itself a scientific calculator then you were ripped off.
End of story.
pretty sure the zune one isn't calling itself scientific.
plus, it's free, how were you "ripped off?"