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  1. product(item1,3000,4.8,20).
  2. product(item2,1800,4.2,200).
  3. product(item3,5000,4.9,5).
  4. product(item4,2500,4.5,80).
  5.  
  6. high_rating(Item) :-
  7.     product(Item, _, Rating, _),
  8.     Rating >= 4.5.
  9.  
  10. affordable(Item) :-
  11.     product(Item, Price, _, _),
  12.     Price =< 3000.
  13.  
  14. popular(Item) :-
  15.     product(Item, _, _, Reviews),
  16.     Reviews >= 50.
  17.  
  18. recommended(Item) :-
  19.     high_rating(Item),
  20.     affordable(Item),
  21.     popular(Item).
Success #stdin #stdout #stderr 0.03s 6992KB
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ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/n1zy0L
language:
Prolog (swi 7.6.4)
created:
6 days ago
visibility:
public

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