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C201: Linked List

Learn about nodes and linked lists, why they are needed, and how to create a linked list in C. Includes operations like insert, search, and remove. Practical examples and node struct definition provided.

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C201: Linked List

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  1. C201: Linked List

  2. Learning Objectives • Nodes and Linked Lists • Operations on Linked List • Insert • Search • Remove

  3. Nodes and Linked Lists • Why do we need linked list? • Linked list • Simple example of "dynamic data structure" • Composed of nodes • Each "node" is variable of struct that’s dynamically created with new • Nodes also contain pointers to other nodes • Provide "links"

  4. Node Definition struct node{ int value; node * next;}; value next node

  5. Node and Linked list value next struct node{ int value; node * next;}; node An incomplete linked list value value value next next next

  6. Node and Linked list value next struct node{ int value; node * next;}; node We need something to indicate the end of the list value value value next next next ?

  7. End Marker • Use NULL for next pointer • (if next==NULL) Indicates no further "links" after this node • Provide end marker for linked list

  8. Node and Linked list value next struct node{ int value; node * next;}; node value value value next next next NULL

  9. Node and Linked list value next struct node{ int value; node * next;}; node We still need a handle to access the nodes the list ? value value value next next next NULL

  10. Head Pointer value next Node * head; • A simple pointer to Node • Set to point to 1st node in list • head is used to "maintain" start of list • Also used as argument to functions head node

  11. Node and Linked list value next struct node{ int value; node * next;}; node head value value value next next next NULL

  12. Node and Linked list value next struct node{ int value; node * next;}; node head value value value next next next 303 202 101 NULL

  13. Data Fields in Node struct student{int ID; double GPA; student * next;};

  14. Data Fields in Node struct student{int ID; double GPA; student * next;}; head ID next ID next ID next GPA GPA GPA 2002 2.5 1001 3.5 3003 3.3 NULL

  15. How to Create a Linked List

  16. How to Create a Linked List 0. Define the node

  17. How to Create a Linked List 0. Define the node struct node{int value; node * next;};

  18. How to Create a Linked List struct node{int value; node * next;}; 1. Create a head

  19. How to Create a Linked List struct node{int value; node * next;}; 1. Create a head node * head = NULL; head NULL

  20. How to Create a Linked List struct node{int value; node * next;}; 2. Create an instance of node head NULL

  21. How to Create a Linked List struct node{int value; node * next;}; 2. Create an instance of node node * n= new node; n head value next NULL

  22. How to Create a Linked List struct node{int value; node * next;}; 2. Dynamically create an instance of node n->value = 303; n->next = NULL; n head value next 303 NULL NULL

  23. How to Create a Linked List struct node{int value; node * next;}; 3. Insert the node to (the head of) the list n->next = head; head = n; n head value next 303 NULL NULL

  24. How to Create a Linked List struct node{int value; node * next;}; 3. Insert the node to the list n head value next 303 NULL

  25. How to Create a Linked List struct node{int value; node * next;}; 3. Insert the node to the list head value next 303 NULL

  26. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes head value next 303 NULL

  27. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes node * n= new node; n->value = 101; n->next = NULL; n value next 101 head value next NULL 303 NULL

  28. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes n->next = head; head = n; n value next 101 head value next NULL 303 NULL

  29. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes n->next = head; head = n; n value next 101 head value next 303 NULL

  30. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes n->next = head; head = n; n value next 101 head value next 303 NULL

  31. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes value next 101 head value next 303 NULL

  32. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes head value value next next 101 303 NULL

  33. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes node * n= new node; n->value = 101; n->next = NULL; n value next 101 NULL head value value next next 101 303 NULL

  34. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes n->next = head; head = n; ; n value next 101 NULL head value value next next 101 303 NULL

  35. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes n->next = head; head = n; n value next 101 head value value next next 101 303 NULL

  36. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes n->next = head; head = n; n value next 101 head value value next next 101 303 NULL

  37. How to Create a Linked List struct node{int value; node * next;}; 4. Repeat Step 2 and Step 3 to create and insert all nodes value next 101 head value value next next 101 303 NULL

  38. How to Create a Linked List struct node{int value; node * next;}; 5. A linked list is created head value value value next next next 101 101 303 NULL

  39. Node Access head->value = 404; head value value value next next next 303 202 101 NULL

  40. Node Access head value value value next next next 303 404 101 NULL

  41. Node Access cout << head->next->value; //What will be displayed head value value value next next next 303 404 101 NULL

  42. Node Access head->next->next->value=505; head value value value next next next 303 404 101 NULL

  43. Node Access head value value value next next next 505 404 101 NULL

  44. Node Access node * temp = head; While (temp != NULL) { cout << temp->value; // access data fields temp = temp->next; } value value value next head next next 505 404 101 NULL

  45. Node Access node * temp = head; While (temp != NULL) { cout << temp->value; // access data fields temp = temp->next; } value value value next head next next 505 404 101 NULL temp

  46. Node Access node * temp = head; While (temp != NULL) { cout << temp->value; // access data fields temp = temp->next; } value value value next head next next 505 404 101 NULL temp

  47. Node Access node * temp = head; While (temp != NULL) { cout << temp->value; // access data fields temp = temp->next; } value value value next head next next 505 404 101 NULL temp

  48. Node Access node * temp = head; While (temp != NULL) { cout << temp->value; // access data fields temp = temp->next; } value value value next head next next 505 404 101 NULL temp

  49. Node Access node * temp = head; While (temp != NULL) { cout << temp->value; // access data fields temp = temp->next; } value value value next head next next 505 404 101 NULL temp

  50. Node Access node * temp = head; While (temp != NULL) { cout << temp->value; // access data fields temp = temp->next; } value value value next head next next 505 404 101 NULL temp

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