Deleting Linked List

[integralfx]

Anyone know why the first code doesn't work while the second one does?

Node* cur = first;
Node* tmp;
while (cur != 0)
{
	tmp = cur;
	cur = cur->next;
	delete tmp;
}

Node** cur = &first;
Node* tmp;
while (*cur != 0)
{
	tmp = *cur;
	*cur = tmp->next;
	delete tmp;
}

[JLBorges]

The first code would work if we add first = nullptr ; after the loop.

node* cur = first ;
while( cur != nullptr ) // favour nullptr over zero
{
    node* tmp = cur ;
    cur = cur->next ;
    delete tmp ;
}

first = nullptr ;

[integralfx]

Thanks :)