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rn2(x) is a pseudo-random number function used in the code of NetHack. The function's purpose is to provide an "unweighted": the range of values is between 0 and x-1 inclusive (that is, 0 ≤ rn2(x) < x).[1]

For example, to simulate a percentage chance:

if (rn2(100) < chance) { ... }



is true with a 1/x probability.

See also rn1.