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--- new:rounding [2018/02/17 00:23] – korshun
+++ new:rounding [2019/04/20 00:41] (current) – removed korshun
@@ Line 1: / Line 1: @@
-===== Rounding functions =====
-These functions round fixed-point numbers to one of the two nearby integers.
-There are four rounding modes:
-  * ''trunc'' -- zeroes the fractional part of the number
-  * ''floor'' -- rounds the number down
-  * ''ceil'' -- round the number up
-  * ''round'' -- rounds the number to the closest integer
-Example rounding table:
-^  x   ^ round(x) ^ floor(x) ^ ceil(x) ^ trunc(x) ^
-^   1.3|         1|         1|        2|         1|
-^   1.8|         2|         1|        2|         1|
-^   1.5|         2|         1|        2|         1|
-^  -1.3|        -1|        -2|       -1|        -1|
-^  -1.8|        -2|        -2|       -1|        -1|
-^  -1.5|        -1|        -2|       -1|        -1|
-Every rounding mode is available as two functions. The ones with the ''i'' prefix in the name return an integer, while the ones without return a fixed-point number:
-^ Mode  ^ as fixed ^ as int ^
-^ floor | ''floor()'' | ''ifloor()'' |
-^ ceil  | ''ceil()'' | ''iceil()'' |
-^ round | ''round()'' | ''iround()'' |
-^ trunc | ''trunc()'' | ''itrunc()'' |
-Example of the difference:
-  * ''floor(2.3) == 2.0;''
-  * ''ifloor(2.3) == 2;'''
-So the full function list is as follows:
-  * ''fixed floor(fixed x)''
-  * ''fixed ceil(fixed x)''
-  * ''fixed round(fixed x)''
-  * ''fixed trunc(fixed x)''
-  * ''int ifloor(fixed x)''
-  * ''int iceil(fixed x)''
-  * ''int iround(fixed x)''
-  * ''int itrunc(fixed x)''

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