Writing in file | Swi-Prolog | Windows

Question

Some script is working successful by swi-prolog 5.11.11 on linux-system, but not so well on windows-system by Swi-Prolog 5.6.48

main :-
    open(\'output.txt         


        

Answer 1

I'm assuming this was meant to be a failure-driven loop. It doesn't work because the close/1 call, as @hardmath says, is never reached since it is preceded by a fail/1 in the same clause. In effect, the output file is apparently not flushed. This failure-driven loop should be written as:

main :-
    open('output.txt', write, OS),
    main(OS).

main(OS) :-
    elements(Points),
    get_set(Eq, Points),
    alpha_isotone(Eq, Points),
    write(OS,Eq), nl(OS),
    false.
main(OS) :- close(OS).