How to use user input in prolog for search

Question

hi, I want to be able to enter a user and then store it and use it in my code.

body(mercury, 36, small, none, none). body(venus, 67, small, atmosphere, none). body(earth, 93, small, atmosphere, none). body(moon, 93, small, none, none). body(mars, 141, small, atmosphere, none). body(jupiter, 489, large, atmosphere, rings). miles(Body,Miles):-write('Enter the Goal State:'),nl, read(X),nl, body(Body, Miles, _, _, _); Miles > X. 

Answer 1

i first switched to the GNU prologue, which helped.

  miles(Body,Miles):-write('Enter the Goal State:'),nl, read(X),nl, body(Body, Miles, _, _, _), Miles > X.