nth/3
Module: builtins
nth/3 — returns the nth element of a list
FORMS
nth(N, List, X)
DESCRIPTION
If List is a list and N is a non-negative integer, then X is the nth element of List.
EXAMPLES
?- nth(1,[larry,moe,curly],X).
X=moe
yes.
ERRORS
If N is not a non-negative integer and less than the length of List, nth/3 will fail. List must be instantiated to a list.