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Calculating the sum of elements of a list 


(define sum
   (lambda(l)
      (if (nullp l)
         zero
         (add (car l) (sum (cdr l))))))



(define l1 (cons one (cons two (cons three nil))))
;
(ndisp! (sum l1))
                             --> 6


Georg P. Loczewski 2004-03-05

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