Simon Albrecht <[email protected]> writes:
> The subject certainly seems cryptic – it’s difficult to summarize, but
> an example will make it clear immediately.
> I want to write a scheme procedure, which takes a pair like #'(3 . 7)
> and returns a list with all the numbers in the range: #'(3 4 5 6 7)
> How is this done most easily?
You mean something like this?
#+BEGIN_SRC scheme :results output
(define pair (cons 3 7))
(define (range first last)
(if (>= first (+ last 1))
'()
(cons first (range (+ first 1) last))))
(display (range (car pair) (cdr pair)))
#+END_SRC
#+RESULTS:
: (3 4 5 6 7)
HTH
Patrick
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