Rounding - Revision history

Hordes: /* History */

2025-11-09T05:43:30Z

‎History

Hordes at 05:39, 9 November 2025

2025-11-09T05:39:41Z

Hordes at 05:39, 9 November 2025

2025-11-09T05:39:27Z

Hordes: a short page on the subject

2025-11-09T05:38:54Z

a short page on the subject

New page

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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 [[range]]s and other numbers that can't feasibly be randomised, bu
*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 [[0.33]].

← Older revision		Revision as of 05:43, 9 November 2025
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	==History==		==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 [[0.33]].	+	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]].

← Older revision		Revision as of 05:39, 9 November 2025
Line 10:		Line 10:

	==History==		==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 [[0.33]].	+	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 [[0.33]].

@@ Line 4: / Line 4: @@
 *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 [[range]]s and other numbers that can't feasibly be randomised, bu
+*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.