Add an element in a list

[sarte]

Hi,
I want to add an element in the head of a list, for instance:
add(a,[b,c],N). N= [a,b,c].
But I'm too stupid, I don't know how to start with the easy case, when the list is empty. I thought of add(A,[],[A]). I think it is wrong, because at the end of a recursive list A will stand at the end(N= [b,c,a]) , and I don't want this.
Can somebody help?

 

[joel76]

Remember that, you can acces, as in Lisp, at the first element of a list and the rest of this list by List = [Head | Tail].

 

[sarte]

Argh, I'm stupid^^ It was so easy. Just "add(A,B,[A|B]).