How to get the return value from gprolog in C?

Hi there,

I am trying to call gprolog in my C code. Instead of getting the solutions,
wonder if I could get the gprolog function output (true/false) directly in
my C code. Below is the example:
Based on - 
http://gprolog.univ-paris1.fr/manual/html_node/gprolog072.html

Given the pl file:
parent(bob,   mary).
parent(jane,  mary).
parent(mary,  peter).
parent(paul,  peter).
parent(peter, john).

anc(X, Y):-
        parent(X, Y).

anc(X, Z) :-
        parent(X, Y),
        anc(Y, Z).

I know how to retrieve the solution from anc(X,john). However, if the query
is anc(bob,john), then how could I retrieve the return value (true) from the
gprolog in my C code? I have gone thru gprolog.h for a while. But it seems
there is not such a func used to get the return value...


Thanks,
Dave




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