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Perl and Prolog

by Zaxo (Archbishop)
on Feb 04, 2002 at 10:11 UTC ( #143198=perlmeditation: print w/replies, xml ) Need Help??

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  1. or download this
    % this is a comment, % is like # in Perl
    % All men are mortal
    ...
        man(X).
    % Socrates is a man.
    man(socrates).
    
  2. or download this
    $ gprolog
    GNU Prolog 1.2.8
    ...
    no
    | ?- halt.
    $
    

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[Lady_Aleena]: Discipulus, it is at 2 now, but with what I am thinking about, it could go to 3. However, only 1 is needed. The second and third are optional.
[shmem]: straight list or named parameters - that depends on whether (and how many) optional arguments you have
[Discipulus]: if so a plain list is ok, imho
[Lady_Aleena]: shmem, I already have the plugin installed, just not active.
[shmem]: if you have 1 optional argument, place that at the end of the list. If you have more, go for named parameters.
[Lady_Aleena]: 1 manditory, 2 optional.
[Discipulus]: my ($need,$opta,$optb ) = @_; .. if $opta..
[shmem]: all else leads to trouble, even if the third argument depends on the existence of the second. That may become brittle.
[Discipulus]: but if have case like subname(15,undef,3 ) maybe bettere named parameters
[Lady_Aleena]: I don't want to have to do: alpha_menu($hash, undef, $type);

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