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plurals

PO
primarykey
Id
19612952
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-10-26T23:16:45.190
FavoriteCount
0
LastActivityDate
2013-10-26T23:34:32.807
LastEditDate
2013-10-26T23:34:32.807
LastEditorUserId
2337890
OwnerUserId
2337890
ParentId
19609519
PostTypeId
2
Score
0
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0
LastEditorDisplayName
text
Body
Not sure why it doesn't work, all those appends and reverses are hard to follow, and not sure what's going on with all that set! stuff. Putting the state into a tail call is a lot easier to follow and usually more efficient to boot. <pre><code> (define (apa-add . Lists) (define (cdrs-no-null L) (cond ((null? L) '()) ((null? (cdar l)) (cdrs-no-null (cdr L))) (else (cons (cdar l) (cdrs-no-null (cdr l)))))) (let loop ((carry 0) (Lists (map reverse Lists)) (sum '())) (if (null? Lists) (if (zero? carry) sum (cons carry sum)) (loop (quotient (fold + carry (map car Lists)) 10) (cdrs-no-null Lists) (cons (modulo (fold + carry (map car Lists)) 10) sum))))) (define (apa-mult . Lists) (define (mult-by-factor n order L) (let loop ((order order) (L (reverse L)) (carry 0) (sum '())) (cond ((> order 0) (loop (- order 1) L carry (cons 0 sum))) ((null? L) (if (zero? carry) sum (cons carry sum))) ;;bug here if carry > 9 (else (loop 0 (cdr L) (quotient (+ carry (* n (car L))) 10) (cons (modulo (+ carry (* n (car L))) 10) sum)))))) (define (apa-mult2 L1 L2) (let ((rL1 (reverse L1)) (rL2 (reverse L2)) (zip-with-order (lambda (L) (let loop ((order 0) (L L) (accum '())) (if (null? L) accum (loop (+ 1 order) (cdr L) (cons (cons (car L) order) accum))))))) (fold apa-add '(0) (map (lambda (x) (mult-by-factor (car x) (cdr x) L2)) (zip-with-order rl1))))) (fold apa-mult2 '(1) Lists))) </code></pre> (apa-mult '(3 1 2) '(6 1 4))) ;Value 7: (1 9 1 5 6 8) (apa-mult '(2 0 0) '(3 1 2) '(6 1 4)) ;Value 8: (3 8 3 1 3 6 0 0) (apa-mult '(7 3 1 2) '(6 1 4)) ;Value 9: (4 4 8 9 5 6 8)
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Title
singulars
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1. This table or related slice is empty.
PostParentId
1. PO"Multiplication of Arbitrary Precision Numbers" in Scheme
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USWorBlux
UserOwnerUserId
1. USWorBlux
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. PO"Multiplication of Arbitrary Precision Numbers" in Scheme
 singulars
 PostTypePostTypeId
 PTQuestion
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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CommentsPostId
1. This table or related slice is empty.

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