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Predicate writeq/1
Availability:built-in
[ISO]writeq(+Term)
Write Term to the current output, using brackets and operators where appropriate. Atoms that need quotes are quoted. Terms written with this predicate can be read back with read/1 provided the currently active operator declarations are identical and Term. Equivalent to write_term(Term, [quoted(true), numbervars(true)]).
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LogicalCaptain said (2020-10-15T11:58:34):0 upvotes 0 0 downvotes
Picture of user LogicalCaptain.

Escape sequences are inserted into the ouput as appropriate:

?- writeq('hel\nlo').
'hel\nlo'
true.

But

?- write('hel\nlo').
hel
lo
true.

Same as for strings, as expected:

?- write("hel\nlo").
hel
lo
true.

and

?- writeq("hel\nlo").
"hel\nlo"
true.

Note that the \n is translated by the Prolog reader into a single newline, it is NOT in the atom or string as such

?- A='hel\nlo',atom_length(A,L).
A = 'hel\nlo',
L = 6.