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  1. % clausulas
  2. hermano("juan", "pedro").
  3. hijo("juancito", "juan").
  4. tio(X, Y) :- hermano(Z, X), hijo(Y, Z).
  5.  
  6. % consultas
  7. ?- write('1. '), tio("pedro", "juancito"), writeln('Pedro es tio de Juancito').
  8. ?- write('2. '), tio("pedro", A), write('Pedro es tio de '), writeln(A).
  9. ?- write('3. '), tio("juancito", B), write('Juancito es tio de '), writeln(B).
Success #stdin #stdout #stderr 0.03s 7940KB
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stdin
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Standard input is empty
stdout
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1. Pedro es tio de Juancito
2. Pedro es tio de juancito
3.
stderr
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Warning: /home/FDcjoB/prog:9:
	Goal (directive) failed: user: (write('3. '),tio("juancito",_G1420),write('Juancito es tio de '),writeln(_G1420))
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/fW63DL
language:
Prolog (swi 7.6.4)
created:
9 years ago
visibility:
public

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