====== Change element ======
{{tag>lists}}
===== Description =====
Changing one element in list to another

**Source**:  PROLOG str. 49 Wydawnictwo PLJ Warszawa 1991 ISBN 83-85190-63-5
===== Download =====
Program source code: {{change_element.pl}}
===== Listing =====
<code prolog>
zastap(_, [], _, []).
zastap(X, [X|L1], Y, [Y|L2]) :- !, zastap(X, L1, Y, L2).
zastap(X, [A|L1], Y, [A|L2]) :- zastap(X, L1, Y, L2).

test :- zastap(malo, [lubie, malo, lodow, i, malo, smietany], duzo, L).</code>
===== Comments =====