[Tutor] Simple RPN calculator

[Kent Johnson]

RPN reverses the order of operator and operand, it doesn't reverse the whole string. So in Polish 
Notation 2 + 3 is +23 and (2 + 3) - 1 is -+231; in RPN they become 23+ and 23+1-

Kent

Brian van den Broek wrote:
> By analogy, I had always assumed that Polish Arithmetic would read
> 
> (2 + 3) - 1 and
> 2 + (3 - 1)
> 
> as:
> 
> -+231 and
> +2-31
> 
> I further assumed that RPN would simply reverse this. If that isn't 
> true, I think I need to go investigate the origins of the name.
> 
> Best to all,
> 
> Brian vdB
> 
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor
>