Cash Register

[Martin Maney]

Greg Ewing <greg at cosc.canterbury.ac.nz> wrote:
> I notice it's nicely agnostic about what kind
> of numbers are used. This will come in very handy
> if complex currency is ever introduced...

>  ITEM          $ 3.50
>  ITEM          $ 2.30j
>  ITEM          $ 1+2j
>  ITEM          $ 0
>         TOTAL  $ (4.5+4.3j)
>          CASH  $ 50
>        CHANGE  $ (45.5-4.3j)

Beautiful demonstration of the principle behind the rule that items
with complex prices may only be sold in conjugate pairs!  :-)

-- 
automation: replacing what works with something that almost works,
but which is faster and cheaper.  - attributed to Roger Needham