rn2
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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) { ... }
See also rn1.
References
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