SketchyLISP Reference |
Copyright (C) 2006 Nils M Holm |
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Conformance: SketchyLISP Core
Purpose: Test whether a number is a natural number. See "digits" for defintions of numbers.
Arguments:
A - number
Implementation:
(define (natural? a) (non-negative? a))
Example:
(natural? 567) => #t
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