Prolog - Listing

Question

I have some problem with trying to work out my code here.

Let's say I have these codes:

university('University of Cambridge', 1, 'United Kingdom', 90.3, 92.8, 89.4),
university('University of Oxford', 2, 'United Kingdom', 88.9, 94.8, 88.0).

How do I list out the names of the universities only? I tried doing listing. and listing(university). but that list out everything or the rules.

Trying to only get the names like:

University of Cambridge
University of Oxford

Answer 1

This gives you one name:

?: university(X,_,_,_,_).

You can query for more with ; or space

To print all of them, you could use a fail driven loop:

?: university(X,_,_,_,_), write(X), nl, fail; true.