rn2
Revision as of 03:32, 27 February 2022 by Umbire the Phantom (talk | contribs) (I don't think there's been any real changes to this...)
rn2(x)[1] is a pseudo-random number function used in NetHack when a result should be unweighted. The range of values is between 0 and x-1 inclusive (that is, 0 ≤ rn2(x) < x).
For example, to simulate a percentage chance:
if (rn2(100) < chance) { ... }
Also,
!rn2(x)
is true with a 1/x probability.
See also rn1.