From 1b2b7c3eb939724696894f31ff27db97b0cac84c Mon Sep 17 00:00:00 2001 From: Andreas Widen Date: Sat, 25 Nov 2023 17:21:37 +0100 Subject: Initial commit. Signed-off-by: Andreas Widen --- apps/aux/numbers.scm | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 apps/aux/numbers.scm (limited to 'apps/aux/numbers.scm') diff --git a/apps/aux/numbers.scm b/apps/aux/numbers.scm new file mode 100644 index 0000000..6c83dcb --- /dev/null +++ b/apps/aux/numbers.scm @@ -0,0 +1,31 @@ +;;; Harmonic Flow web site + +(define-module (apps aux numbers) + #:use-module (srfi srfi-1) + #:export (minus-one + plus-one + range)) + + +(define (minus-one n) + "Return N-1." + (- n 1)) + + +(define (plus-one n) + "Return N+1." + (+ n 1)) + + +(define (range a b) + "Return the list of integers in the range [A, B]. + + A (integer) + + B (integer) + + RETURN VALUE (list of integers) + For example, for the range [-2, 3], return + (list -2 -1 0 1 2 3)." + (cond ((zero? (- a b)) (cons a (list))) + (else (cons a (range (plus-one a) b))))) -- cgit v1.2.3-54-g00ecf