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FAMILY.FIL
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1985-07-11
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870b
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31 lines
/*=============================================================================*/
/* To analyze the family structure of the family of Queen Victoria.
English friend of mine notes there wasn't a Harry. I put him in.
Answers the compelling question: Who is X the sister of?
Ask: ?-sisterof( alice, X ). or ?-sisterof( alice, harry ).
or ?-sisterof( alice, X ), loves( X, wine ). as an example of a
complex question.
or even:
sisterof( alice, X ), loves( X, wine ), loves( alice, wine ).
*/
sisterof( X, Y ) :- parents( X, M, F ),
female( X ),
parents( Y, M, F ).
parents( edward, victoria, albert ).
parents( harry, victoria, albert ).
parents( alice, victoria, albert ).
female( alice ).
loves( harry, wine ).
loves( alice, wine ).
/*=============================================================================*/