public void LIST_INSERT_(ListObject x)
{
x.next = nil.next;
nil.next.prev = x;
nil.next = x;
x.prev = nil;
}
private void buttonInsert_Click(object sender, EventArgs e)
{
ListObject x = new ListObject((int)numericUpDownLinkedList.Value);
//linkedlist.LIST_INSERT_(x);
linkedlist.LIST_INSERT(x);
numericUpDownLinkedList.Value = numericUpDownLinkedList.Value + 1;
UpdateLinkedList();
}
//sentinel included functions
public ListObject LIST_SEARCH_(int k)
{
ListObject x = nil.next;
while ((x != nil) & (x.key != k))
{
x = x.next;
}
return(x);
}
public void LIST_INSERT(ListObject x)
{
x.next = head;
if (head != null)
{
head.prev = x;
}
head = x;
x.prev = null;
}
//
public ListObject LIST_SEARCH(int k)
{
ListObject x = head;
while ((x != null) & (x.key != k))
{
x = x.next;
}
return(x);
}
public void LIST_DELETE(ListObject x)
{
if (x.prev != null)
{
x.prev.next = x.next;
}
else
{
head = x.next;
}
if (x.next != null)
{
x.next.prev = x.prev;
}
}
private void UpdateLinkedList()
{
listBoxLinkedList.Items.Clear();
comboBoxKeys.Items.Clear();
//ListObject x = linkedlist.Nil.next;
//while (x != linkedlist.Nil)
//{
// listBoxLinkedList.Items.Add(x.key);
// comboBoxKeys.Items.Add(x.key);
// x = x.next;
//}
ListObject x = linkedlist.Head;
while (x != null)
{
listBoxLinkedList.Items.Add(x.key);
comboBoxKeys.Items.Add(x.key);
x = x.next;
}
}
public void LIST_DELETE_(ListObject x)
{
x.prev.next = x.next;
x.next.prev = x.prev;
}
public LinkedList()
{
head = null;
nil = new ListObject(null);
}
public ListObject(int?k)
{
prev = null;
next = null;
key = k;
}
