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  1. animal(dog).
  2. animal(cat).
  3.  
  4. ?- animal(X).
  5.  
Success #stdin #stdout #stderr 0.03s 6816KB
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stdin
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1
2
10
42
11
stdout
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Standard output is empty
stderr
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Warning: /home/nhM7Xk/prog:4:
	Singleton variables: [X]
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? EOF: exit
https://ideone.com/va5Lxg
language:
Prolog (swi 7.6.4)
created:
11 days ago
visibility:
public

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