Question

USING SCHEME PROGRAMMING LANGUAGE

define a function addSubList that processes a list of lists of numbers and adds up all sub-lists. The output of your function is a flat list of numbers. (You can assume that your function only receives valid input).

Example:

  (define Q '(1 2 (3 4) 1 5 (7 8)))
;;;;;;;;;;;;;;;;;;;;;
; (addSubList Q)      
; => '(1 2 7 1 5 15)
;;;;;;;;;;;;;;;;;;;

Answer 1

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; (define (sum a b)
; (display "x + y = ")
; (display (+ a b)))

; (sum 10 25)
; (newline)
(define (sum ls)
(cond
((null? ls) 0 )
((= 0 0) (+ (car ls) (sum (cdr ls ))))))
  
(define (addSubList Q)
(cond
((null? Q) Q)
((integer? (car Q)) (cons (car Q) (addSubList (cdr Q))))
((= 0 0) (cons (sum (car Q)) (addSubList (cdr Q))))))
  
(display (addSubList '(1 2 (3 4) 1 5 (7 8))))