CODEWITHSUNDEEP
prologprolog-toplevel
Utku
Utku

Reputation: 21

How to list more than 1 output on prolog query?

Imagine my siblings, my cousins and me and our total count is 10. So i write this code and when i run it, it just give me 1 output. How can i print all the X values(names) on this query. And if possible how can i change what name comes first or how can i choose as a like what 3rd or 5th name would be ? (My granduncle is my grandfather's brother.)

Here is my code and output

granduncle(T,X) :- brother(T,Z),parent(Z,Y),parent(Y,X).


?- granduncle(john,X).
X=stan

Upvotes: 2

Views: 387

Answers (1)

David Tonhofer
David Tonhofer

Reputation: 15316

You need to use the collection predicates:

bagof/3 setof/3

and

findall/3

to collect all the solutions into a single list.

For example:

bagof(X,granduncle(john,X),Bag).

will create a list of solutions in Bag.

Then you can slice & dice the list with predicates like:

Upvotes: 1

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