[erlang-questions] catch

[ok@REDACTED]

> I have this escript to create a list of output:
>
> main([String]) ->
> 	case length(String) of
> 		0 -> io:format("~nDid you forget the number?~n~n");
> 		_ ->

...

Just as a matter of curiosity, why not write

main([String]) ->
    case String
      of [] -> ...
       ; _  -> ...
    end.

or even

main([""]) -> ...;
main([String]) -> ...

Also, why are you calling list_to_integer/1 twice?

    case catch list_to_integer(String)
      of {'EXIT',{badarg,_}} -> ...
       ; I -> ...
    end

You did *try* typing
1> catch list_to_integer("fred").
2> catch list_to_integer("100").
didn't you?