Prolog element is a list member check

Question

I have a little rule in prolog that has to check if an element is a member of a list and write it\'s position in the list,but it only works if the elemebt i\'m looking for is in

Answer 1

Since you report it's working only for the first position, here is the simpler correction possible to your code to make it work in other cases:

write_element(X,[X|_],1).
write_element(X,[_|Tail],N):-
  write_element(X,Tail,N1),
  N is N1 + 1.

but the answer from Daniel (+1) is what you should study.