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| re: dear prof tobot |
| [29729] by "max cooking"
(ce-web1.wesleyan.edu) on Tue 09 Dec 2003 21:07:42
[
reply ]
|
- fun makelist 0 = nil
| makelist 1 = nil
| makelist x = x :: (makelist (x-1));
i don't want 2 include the 1 i guess cause if I am making a prime # list using makelist as a way 2 generate possible factors for a number i don't want 1 to b included bcause that will always hav a 0 remainder
AND
wow about that list stuff that is helpful!! thx prof
now i no how 2 check divisibility by 3, for example:
fun divthree x = x mod 3 = 0;
owo!! ok now could u plz teach me how 2 do this sort of thing w/ a list? like i want 2 make a prime test by doing something like (english is inside {{{{ }}}}):
fun prime 0 = "false"
| prime x =
if x mod {{{{any of the list of integers from 2 through x}}}} = 0
then "true"
else "false";
but this is totaly illegal of course so i need help!!! thx profesor |
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