Re: where do I think wrong

Found it.
This is the right one.:

have_siblings(C) :-
    ( ( is_father(X,C), is_father(X,S) ) 
    ;( is_mother(Y,S), is_mother(Y,C) )), 
    C \= S,
    write(S).
    

But im not complete happy. 

When I now do have_siblings(chantal) I see this output.

De broers/zusters van chantal zijn :

dagmar
true ;
true.

Which is good. 

But when I do have_siblings(gerda) I see this output:

De broers/zusters van gerda zijn :

roelof
true ;
roelof
true 

So when a father and a mother are known then the sibling are displayed twice. 

Roelof


> Date: Thu, 13 Mar 2014 12:10:44 +0100
> From: [email protected]
> To: [email protected]
> Subject: Re: [SWIPL] where do I think wrong
> 
> 
> Am 13.03.2014 12:05, schrieb Roelof Wobben:
> > I changed it to what you said.
> > 
> > have_siblings(C) :-
> >     ( ( is_father(X,C), is_father(X,S) ) 
> >     ;( is_mother(Y,S), is_mother(Y,C) ), 
> >     C \= S,
> >     write(S).
> > 
> > but now I see a operand missing errror.
> 
> Indeed. Was just mail-programming. I missed a closing parenthesis. Do
> the counting. Read the other mail (Kilian Evang) and fix it. I know you
> can do it ;-) Regards, dsp
> 
> -- 
> GPG/PGP KeyID: 0xD15FCEF6
> 
> Daniel Speicher                                     University of Bonn
> +49 (0228) 73-4315                   Institute of Computer Science III
> [email protected]                                  Roemerstrasse 164
> http://sewiki.iai.uni-bonn.de/dsp                         D-53117 Bonn
> 
> 
 		 	   		  
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