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  1. countdown(X).
  2. ?- write(X).
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
countdown(X).
compilation info 
prog.pl:1: warning: singleton variables [X] for countdown/1
prog.pl:2:4: syntax error: . or operator expected after expression
	1 error(s)
compilation failed
stdout 
Standard output is empty
https://ideone.com/SJMoD
language:
Prolog (gprolog 1.4.5)
created:
14 years ago
visibility:
public

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