Insertion of a Node in a Linked List(at beginning, end, specified position)| GATECSE| Data Structure

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There are three different possibilities for inserting a node into a linked list. These three possibilities are:
Insertion at the beginning of the list.
Insertion at the end of the list
Inserting a new node except the above-mentioned positions.
Algorithm
1. Declare a head pointer and make it as NULL.
2. Create a new node with the given data.
3. Make the new node points to the head node.
4. Finally, make the new node as the head node.
Time complexity of append is O(n) where n is the number of nodes in linked list. Since there is a loop from head to end, the function does O(n) work.
C program to create and display a Singly Linked List.
C program to insert a node at the middle of a Singly Linked List.
C program to insert a node at the end of a Singly Linked List.
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