411 REFERENCE · Wikibooks
Rebol Programming/sign?
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
USAGE:
SIGN? number
DESCRIPTION:
Returns sign of number as 1, 0, or -1 (to use as multiplier).
SIGN? is a function value.
ARGUMENTS
number -- (Type: number money time)
SOURCE CODE
sign?: func [
{Returns sign of number as 1, 0, or -1 (to use as multiplier).}
number [number! money! time!]
][
either positive? number [1] [either negative? number [-1] [0]]
]