In computer science, a linked list is a data structure consisting of a group of nodes which together represent a sequence. Under the simplest form, each node is composed of a data and a reference (in other words, a link) to the next node in the sequence; more complex variants add additional links. The six operations of linked list is explained in this slide

1. LINKED LIST OPERATIONS
By,
Shashank Shetty
Assistant Professor,
Department of ISE
NMAMIT, Nitte
Shashankshetty@nitte.edu.in

2. Inserting a node into a SLL
There are many ways you might want to
insert a new node into a list:
As the new first element
As the new last element
 In the middle of the two nodes or in some
designated position.
Shashankshetty@nitte.edu.in

3. 25
1) Insert a node at the beginning of the list
// Algorithm : Insertion (Item)
// Description : Inserts a node at the beginning of
the SLL
Step1: Start
Step 2: NewNode=getnode()
NewNode -> link = NULL
NewNode -> info = Item
Step 3: [ If the Linked list is empty, then the New
Node Created is a first node or Head Node]
if(Head==NULL)
Head=NewNode
return
End if
Step 4: [If the linked list is not empty]
NewNode -> link= Head
Head= NewNode
Free(NewNode)
Step 5: Return (Stop)
Item NULL
NewNode
Head
NULL
4 6 NULL
Head
254 6 NULLItem
Head
Shashankshetty@nitte.edu.in

4. 2) Insert a node at the End of the list
// Algorithm : Insertion (Item)
// Description : Inserts a node at the End of
the SLL
Step1: Start
Step 2: NewNode=getnode()
NewNode -> link = NULL
NewNode -> info = Item
Step 3: [ If the Linked list is empty, then the
New Node Created is a first node or Head
Node]
if(Head==NULL)
Head=NewNode
return
End if
Step 4: [If the linked list is not empty]
Cur= Head
While (Cur-> link !=NULL)
Cur=Cur->link
end while
Step 5: Cur -> link= NewNode
Step 6: Free(NewNode)
Free (Cur)
Step 5: Return (Stop)
25
Item NULL
NewNode
Head
NULL
4 6 NULL
Head
625 item NULL4
Head
Cur Cur
Shashankshetty@nitte.edu.in

5. Shashankshetty@nitte.edu.in
3) Insert a node at the middle of two nodes or at
the designated position
// Algorithm : Insertion (Item, position)
// Description : Inserts a node at the middle or at the
designated position of the SLL
Step1: Start
Step 2: NewNode=getnode()
NewNode -> link = NULL
NewNode -> info = Item
Step 3: [ If the Linked list is empty, then the New Node
Created is a first node or Head Node]
if(Head==NULL)
Head=NewNode
return
End if
Step 4: [If the linked list is not empty]
Cur= Head
While (Cur!=position-1)
Cur=Cur->link
end while
Cur1=Cur->link
Step 5: Cur->link= NewNode
NewNode->link= Cur1
Step 6: Free(NewNode)
Free (Cur)
Free(Cur1)
Step 5: Return (Stop)
25
Item NULL
NewNode
Head
NULL
4 6 NULL
Head
625 item NULL4
Head
Cur Cur
1 2 3
Let Us insert
the new
node at
position 3!!!
Cur1

6. Shashankshetty@nitte.edu.in
Deleting a node from SLL
There are many ways you might want to
delete a new node from a list:
Delete first element
Delete last element
 From the middle of the two nodes or in some
designated position.

7. Shashankshetty@nitte.edu.in
25
1) Delete a node from the beginning of the list
// Algorithm : Deletion (Item)
// Description : Delete a node from the beginning of
the SLL
Step1: Start
Step 2: [If Empty List]
If (Head==NULL)
Display (“List Empty”)
Return
EndIf
Step 3: [If the linked list is not empty]
Temp=Head
Head=Head-> link
display (temp->info)
Free(Temp)
Step 4: Return (Stop)
Head
NULL
4 6 NULL
Head
25 6 NULL
Head
List
Empty
Temp

8. Shashankshetty@nitte.edu.in
25
2) Delete a node from the End of the list
// Algorithm : Deletion (Item)
// Description : Delete a node from the end of the
SLL
Step1: Start
Step 2: [If Empty List]
If (Head==NULL)
Display (“List Empty”)
Return
EndIf
Step 3: [If the linked list is not empty]
Temp=Head
While(temp->link!=NULL)
temp1=temp
temp=temp->link
end while
temp1->next=NULL
display (temp->info)
Free(Temp)
Step 4: Return (Stop)
Head
NULL
4 6 NULL
Head
NULL
Temp1
List
Empty
Temp TempTemp1 Temp
NULL
25
Head
4

9. Shashankshetty@nitte.edu.in
3) Delete a node from the Middle positionor from
specified position
// Algorithm : Deletion (Item, position)
// Description : Delete a node from the
specified position of the SLL
Step1: Start
Step 2: If(Position<=0 or position>length)
Display(“Node position doenot exist”)
EndIf
Step 3: [If Empty List]
If (Head==NULL)
Display (“List Empty”)
Return
EndIf
Step 3: [If the linked list is not empty]
Temp=Head
While(temp !=pos)
temp1=temp
temp=temp->link
end while
temp1->next=temp->next
display (temp->info)
Free(Temp)
Step 4: Return (Stop)