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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) { ... }



is true with a 1/x probability.

See also rn1.


This page may need to be updated for NetHack 3.6.0.

It may contain text specific to NetHack 3.4.3. Information on this page may be out of date.

Editors: After reviewing this page and making necessary edits, please change the {{nethack-343}} tag to {{nethack-360}} or {{noversion}} as appropriate.