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In: Computer Science

give an arbitrary list of integers, how many are 3? (in scheme)

give an arbitrary list of integers, how many are 3? (in scheme)

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Expert Solution

SOURCE CODE:

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;; name the function as count that takes a number(3 in our case) and a list of numbers

(define (count x L)

      ( ;;if the list is null, then return 0 number of occurrences of x

if (null? L)

        0

        (if (eq? x (car L)) ;; for each number in the list if x is equal to that number,

          (+ 1 (count x (cdr L))) ; increase the count

          (count x (cdr L))))) ;; finally return the output of total count of x occurences

Ex:

(count 3 (list 1 3 3 0 12 -5) )

==================

venereology answered 10 months ago
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