public CSLinkedList InsertNode(CSLinkedList list, int data)
{
Node newNode = new Node(data);
if (list.head == null)
{
list.head = newNode;
return(list);
}
else
{
if (list.head.next == null)
{
list.head.next = newNode;
return(list);
}
Node lastNode = list.head;
while (lastNode.next != null)
{
lastNode = lastNode.next;
}
lastNode.next = newNode;
return(list);
}
}
static void Main(string[] args)
{
Console.WriteLine("\t\tCustom Linked List");
Console.WriteLine("\t\t**************");
CSLinkedList list = new CSLinkedList();
list.InsertNode(list, 1);
list.InsertNode(list, 2);
list.InsertNode(list, 3);
list.InsertNode(list, 5);
list.PrintList(list);
list.DeleteByKey(list, 3);
list.DeleteByKey(list, 1);
list.DeleteByKey(list, 7);
Console.WriteLine("Adding a new element at the end of the list");
list.InsertNode(list, 43);
list.PrintList(list);
Console.WriteLine("-------------------");
list.PrintList(list);
Console.WriteLine("Adding a new element at random positions in list");
list.InsertAtPosition(list, 77, 6);
list.InsertAtPosition(list, 77, 4);
list.InsertAtPosition(list, 71, 1);
list.InsertAtPosition(list, 73, 3);
Console.ReadKey();
}
public void InsertAtPosition(CSLinkedList list, int data, int position)
{
if (position > list.Length(list) + 1 || position < 1)
{
Console.WriteLine("Can't add to this position. Position doesn't exist");
return;
}
else if (position == list.Length(list) + 1)
{
Console.WriteLine("List length is {0} and position is {1}.Appending at the end of the list", list.Length(list), position);
list.InsertNode(list, data);
list.PrintList(list);
}
else if (position == 1)
{
Console.WriteLine("Adding new node at the beginning of the list");
Node newNode = new Node(data);
Node currHead = list.head;
list.head = newNode;
newNode.next = currHead;
list.PrintList(list);
}
else
{
int currPosition = 2;
Node previousNode = list.head;
Node currNode = previousNode.next;
Node newNode = new Node(data);
while (currNode.next != null)
{
if (position == currPosition)
{
previousNode.next = newNode;
newNode.next = currNode;
Console.WriteLine("Adding new node at position {0}", position);
Console.WriteLine("Printing updated list...");
list.PrintList(list);
return;
}
previousNode = currNode;
currNode = currNode.next;
currPosition++;
}
}
}
public void PrintList(CSLinkedList list)
{
if (list.head != null)
{
Node currNode = list.head;
if (currNode.next == null)
{
Console.WriteLine(list.head.data + "\t");
return;
}
while (currNode.next != null)
{
Console.Write("\t" + currNode.data);
currNode = currNode.next;
}
Console.WriteLine("\t" + currNode.data);
}
}
public void DeleteByKey(CSLinkedList list, int key)
{
if (list.head != null)
{
Node currNode = this.head;
if (currNode.data == key)
{
list.head = currNode.next;
Console.WriteLine("Key {0} found and deleted. Printing updated list...", key);
list.PrintList(list);
return;
}
else
{
Node previousNode = currNode;
currNode = currNode.next;
while (currNode.next != null)
{
if (currNode.data == key)
{
previousNode.next = currNode.next;
Console.WriteLine("Key {0} found and deleted. Printing updated list...", key);
list.PrintList(list);
return;
}
previousNode = currNode;
currNode = currNode.next;
}
if (currNode.data == key)
{
previousNode.next = null;
Console.WriteLine("Key {0} found and deleted. Printing updated list...", key);
list.PrintList(list);
return;
}
Console.WriteLine("Key {0} not found. Printing list...", key);
list.PrintList(list);
}
}
}
public int Length(CSLinkedList list)
{
int length = 0;
if (list.head == null)
{
length = 0;
}
else if (list.head.next == null)
{
length = 1;
}
else
{
Node currNode = list.head;
while (currNode.next != null)
{
length++;
currNode = currNode.next;
}
length++;
}
return(length);
}
