>> But a result which is not necessarily the same each time you calculate 
>> the
>> answer using the same dataset as input.
>
>  You should never rely on getting an exact result when calculating with
> floating point numbers anyways.


But don't a number of video games, RTS's in particular, rely on getting 
exactly the same results when given the same input? I believe the IEEE 
standard specifies deterministic rounding ( 
http://en.wikipedia.org/wiki/IEEE_754#Rounding_floating-point_numbers ), 
which is probably why they work. Round-to-even has basically the same 
properties as the random method you gave.


 - Slime
 [ http://www.slimeland.com/ ]

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