fac(0,1) :- !. fac(N, Nfac) :- N>0, M is N-1, fac(M, Mfac), Nfac is N*Nfac.
10
GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz
uncaught exception: error(syntax_error('user_input:1 (char:3) . or operator expected after expression'),read_term/3)