legacy code retreat's triva game : the D version

Timon Gehr timon.gehr at gmx.ch
Sat Dec 21 17:09:10 PST 2013


On 12/22/2013 01:07 AM, Marco Leise wrote:
> ...
> It didn't cause issues for any of the other students, but on
> this particular computer the random seed that the Random ctor
> chose caused a degenerate case where it never hit any of the 3
> remaining indexes of the list.
>
> The morale is that "uniform" random numbers doesn't imply that
> every value in the range will eventually be generated once!
>

Yes it does. (The probability that some value is never generated is 0.) 
The actual morale is that random number generators do not generate true 
randomness, and poor random number generators may generate sequences 
that do not look remotely random.


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