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Why does this arithmetic code return lists?
I'm currently working my way through exercise 3.17 of SICP. I know that I'm messing it up and I intend to fix that later. I will not link the exercise, as it is not relevant. This was one of my attemp...
J. Mini
Votes: 0
Answers: 1
About "Frames as Repository of Local State"
SICP, Exercise 3.10 in section 3.2.3 shows the following as an alternative to a previously defined make-withdraw:
(define (make-withdraw initial-amount)
(let ((balance initial-amount))
(lambda (...
Enlico
Votes: 0
Answers: 1
Every solution that I've seen for SICP Exercise 3.16 appears to cheat by creating more than three pairs. Where is my misunderstanding?
SICP Exercise 3.16 gives the reader a broken procedure for counting the numbers of pairs in a list structure:
(define (count-pairs x)
(if (not (pair? x))
0
(+ (count-pairs (car x))
...
J. Mini
Votes: 0
Answers: 1
Why can't we assimilate the predicates number? and same-variable? into the data-directed dispatch?
In exercise 2.73 from section 2.4.3, the following code is shown:
(define (deriv exp var)
(cond ((number? exp) 0)
((variable? exp) (if (same-variable? exp var) 1 0))
(else ((get '...
Enlico
Votes: 0
Answers: 1