Converting string to integers or chars to integers

[sstteevvee]

Hey guys, I'm trying to get an input from the user as a string consisting only of numbers and converting it to a list of integers. I can read the string in and convert it to a list of characters but i don't know how to convert these characters to integers, or how to convert the origional string to a list of integers..? Anyways, here is my code to convert to a list of characters, is there a way to convert these to integers or a better way of achieving this??

convert :-
fmt_read("%s",X,_),
atom_chars(X,L),
write(L), nl.

eg:
$convert.
123058469
X = [1,2,3,0,5,8,4,6,9].

 

[kahleen]

I'm not sure what fmt_read is. Which version of Prolog are you using?

 

[sstteevvee]

I'm not sure, i am running it over SSH Secure Shell.

$ prolog
xsb -i
[xsb_configuration loaded]
[sysinitrc loaded]
[packaging loaded]

XSB Version 2.6 (Duff) of June 24, 2003
[sparc-sun-solaris2.9; mode: optimal; engine: slg-wam; gc: indirection; scheduling: local]

the fmt_read("%s",X,_), reads in a string from the user.
I dont have to use this, it was the only way i new how to read in a string.

 

[joel76]

I don't know how it works with your Prolog.
In SWI-Prolog a string is a list of codes :

?- L = "Hello World !".
L = [72,101,108,108,111,32,87,111,114,108,100,32,33].

So, in SWI-Prolog, you can do that :

?- L = "Hello World !", maplist(char_code, S, L).
L = [72,101,108,108,111,32,87,111,114,108,100,32,33],
S = ['H',e,l,l,o,' ','W',o,r,l,d,' ',!] .

.
But, if you work with a number (e.g. 123058469), it's different :

test(V) :-
    number_chars(V, LC),
    maplist(number_chars_, LD, LC),
    write(LD), nl.


number_chars_(N, C) :-
    number_chars(N, [C]).

output :

?- test(123456).
[1,2,3,4,5,6]
true

 

[joel76]

For a string of digits, you can find everything you need in what I wrote.

 

[jdf442]

Cheers Joel!!!