t3x.org / sketchy / library / naturalp.html
SketchyLISP
Reference
  Copyright (C) 2006
Nils M Holm

natural?

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

See also:
digits, natural.