Search:

Lets drop the code back to pseudo-code and analyze the algorithm.

while ( pointer is NOT null )

// do some things
// else do some things
// ok that is enough doing

Now that pointer is...

If you are asking how to get the average of the elements of a linked list, the answer is to add every element to a total and divide by the number of elements.

Dividing by 2 only gives the average...