Re: last item. no output

Sébastien Dailly
[email protected] [ocaml_beginners] schreef op
18-10-2014 13:22:

Le 18/10/2014 11:21, Roelof Wobben [email protected] [ocaml_beginners] a
écrit :

Hello,

I try to solve the first challenge from the 99 ocaml problems where I
have to find the last item in a list.

So I have this :

let rec last list =
match list with
| [] -> []
| [x] -> x
| hd :: tl -> last tl
;;

I saved it into a file called test.ml and build it with corebuild
test,native.
But when I do ,/test.native [] or ./test.native [1] I see total no output.

Hello,

I think your are confusing 2 things :

- arguments in a function
- arguments in a program

When you do ./test.native [] you give the string « [] » to the ocaml
program. This is not automagicaly passed to the function « last ».

Actualy, your program has a function which is never called…

Hope this help,

Oke,

I think your remark has to do with this problem :

last [1] ;;                                                                                                                                                                           Â

Error: This expression has type int but an expression was expected of type                                                                                                              Â

         'a list                                                                                                                                                                       Â

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Posted by: Roelof Wobben <[email protected]>
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