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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Leap-year/REBOL/leap-year.rebol Normal file
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leap-year?: func [
{Returns true if the specified year is a leap year; false otherwise.}
year [date! integer!]
/local div?
][
either date? year [year: year/year] [
if negative? year [throw make error! join [script invalid-arg] year]
]
; The key numbers are 4, 100, and 400, combined as follows:
; 1) If the year is divisible by 4, it’s a leap year.
; 2) But, if the year is also divisible by 100, it’s not a leap year.
; 3) Double but, if the year is also divisible by 400, it is a leap year.
div?: func [n] [zero? year // n]
to logic! any [all [div? 4 not div? 100] div? 400]
]