K. M. Pitman wrote:

but instead of the LOOP version above you would probably write:

(define (add-up number-list)
(let continue ((remaining-items number-list) (sum-so-far 0))
(if (null? remaining-items)
sum-so-far
(add-up (cdr remaining-items)
(+ sum-so-far (car remaining-items))))))

Wrong. You didn't even use "continue". Understand?

Gauche Scheme

(do ((sum 0 (+ sum (pop! nums))))
((null? nums) sum))

Another way.

(use srfi-42 :only (sum-ec))

(define (add-up number-list)
(sum-ec (:list x number-list) x))

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