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  1. :- initialization(main).
  2.  
  3. main :-
  4.     (   grandparent(robert, alice)
  5.     ->  writeln('Robert adalah kakek Alice')
  6.     ;   writeln('Hubungan tidak ditemukan')
  7.     ),
  8.     halt.
Success #stdin #stdout #stderr 0.02s 7012KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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ERROR: /home/jmiI3R/prog:1: Initialization goal raised exception:
ERROR: main/0: Undefined procedure: grandparent/2
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/8kOgmS
language:
Prolog (swi 7.6.4)
created:
8 days ago
visibility:
public

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