Question

i am currently trying to convert an integer into a list.

E.g.

1234 => List composed of 1, 2, 3, 4

I have this:

(string->list (number->string 1234)) 

Unfortunately it adds #’s and \’s to it. I am guessing this is a string representation of a number. How can i remove these symbols. Since i need to reorder the integers, and print out a list.

This is the output of the command above:

(#\1 #\2 #\3 #\4)

Answer 1

Here’s a function I wrote that breaks the number down by dividing by 10 each time:

(define (num->list num)   (if (< num 10)       (list num)       (append (num->list (floor (/ num 10)))               (list (- num (* 10 (floor (/ num 10)))))))) 

Obviously this will only work with positive integers, but if you need negatives it can be easily modified.