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''Crawl'' uses several types of '''rounding''':
*Always round up: Numbers are rounded up.
*Always round down (truncate): Numbers are rounded down, thus ignoring the decimal place. By default, C++ truncates numbers, so if there's no other indication in the code, it'll be rounded down.
*Round half up: 0.5 and up are rounded up, else round down. This may be used for ranges and other numbers that can't feasibly be randomised.
*Weighted rounding (''rounded in a weighted manner''): The number is tracked, typically to the hundredths place. The decimal place remainder is the % chance to round up. This is very commonly used to avoid hard breakpoints, e.g., spell damage, shield encumbrance, time used to take actions, [[AC]]/[[EV]] all use weighted rounding.
**For example, if you would take 4.30 [[aut]] to move, you instead have a 30% chance to move at 5 aut, and a (100%-30%=) 70% chance to move at 4 aut.
**If you have 35.5 [[AC]], for each hit, there is a 50% chance for your AC to be treated as 35, and a 50% chance for your AC to be treated as 36.

==History==
In general, as the versions progressed, more and more things started to use random rounding. For example, [[AC]] and [[EV]] weren't randomly rounded until [[0.32]].

Rounding - Revision history

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