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  1.  
  2. female(gerlinde).
  3. female(karin).
  4. female(lena).
  5. female(eva).
  6. female(paula).
  7. female(marlene).
  8.  
  9. male(alex).
  10. male(helmut).
  11. male(mark).
  12. male(andre).
  13.  
  14. parent(gerlinde,mark).
  15. parent(gerlinde, lena).
  16. parent(alex,mark).
  17. parent(alex, lena).
  18. parent(karin,andre).
  19. parent(karin,eva).
  20. parent(helmut,andre).
  21. parent(helmut,eva).
  22. parent(lena,paula).
  23. parent(lena,marlene).
  24. parent(andre,paula).
  25. parent(andre,marlene).
  26.  
  27. mother(M,C) :- female(M), parent(M,C).
  28. father(M,C) :- male(M), parent(M,C).
  29. grandparent(G,C) :- parent(G,A), parent(A,C).
  30. grandfather(G,C) :- parent(G,A), parent(A,C), male(G).
  31.  
  32.  
  33.  
  34. sister(S,X) :- female(S), mother(A,S), mother(A,X), father(B,S), father( B,X),X\==S.
Success #stdin #stdout 0.01s 5296KB
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GNU Prolog 1.4.5 (64 bits)
Compiled Feb  5 2017, 10:30:08 with gcc
By Daniel Diaz
Copyright (C) 1999-2016 Daniel Diaz
| ?- 
uncaught exception: error(syntax_error('user_input:1 (char:7) . or operator expected after expression'),read_term/3)
| ?-
https://ideone.com/QXBoBS
language:
Prolog (gprolog 1.4.5)
created:
1 day ago
visibility:
public

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