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  1. //
  2. //  main.cpp
  3. //  Linked List
  4. //
  5. //  Created by Himanshu on 12/09/21.
  6. //
  7.  
  8. #include <iostream>
  9. using namespace std;
  10.  
  11. struct node {
  12.     int info = 0;
  13.     struct node *next;
  14. };
  15. typedef struct node Node;
  16.  
  17. node* newNode(int data)
  18. {
  19.     node* Node = new node();
  20.     Node->info = data;
  21.     Node->next = NULL;
  22.  
  23.     return(Node);
  24. }
  25.  
  26. void printLinkedList (Node* head) {
  27.     Node *x = head;
  28.  
  29.     while (x != NULL) {
  30.         cout<<(x->info)<<" ";
  31.         x = x->next;
  32.     }
  33.     cout<<endl;
  34. }
  35.  
  36. Node* insertNode (Node *head, Node* x) {
  37.     x->next = head;
  38.     head = x;
  39.     return head;
  40. }
  41.  
  42. Node* searchNode (Node *head, int k) {
  43.     Node* x = head;
  44.  
  45.     while (x != NULL && x->info != k) {
  46.         x = x->next;
  47.     }
  48.  
  49.     if (x != NULL && x->info == k) {
  50.         return x;
  51.     } else {
  52.         return NULL;
  53.     }
  54. }
  55.  
  56. Node* insertAtPosition (Node *head, Node* x, int k) {
  57.     Node* node = head;
  58.  
  59.     while (node != NULL && node->info != k) {
  60.         node = node->next;
  61.     }
  62.  
  63.     if (node != NULL) {
  64.         x->next = node->next;
  65.         node->next = x;
  66.     }
  67.     return head;
  68. }
  69.  
  70.  
  71. Node* deleteNode (Node *head, int k) {
  72.     Node* x = head, *prev = NULL;
  73.  
  74.     if (x != NULL && x->info == k) {
  75.         head = x->next;
  76.  
  77.         //To prevent Memory Leak
  78.         delete (x);
  79.         return head;
  80.     }
  81.  
  82.     while (x != NULL && x->info != k) {
  83.         prev = x;
  84.         x = x->next;
  85.     }
  86.  
  87.     // Deleting a node, requires the node
  88.     // previous to the node to be deleted.
  89.     if (x != NULL) {
  90.         prev->next = x->next;
  91.  
  92.         //To prevent Memory Leak
  93.         delete (x);
  94.     }
  95.     return head;
  96. }
  97.  
  98. int main() {
  99.     Node *head = newNode(5);
  100.     head = insertNode (head, newNode(4));
  101.     head = insertNode (head, newNode(3));
  102.     head = insertNode (head, newNode(2));
  103.     head = insertNode (head, newNode(1));
  104.  
  105.     cout<<"Linked List:"<<endl;
  106.     printLinkedList(head);
  107.  
  108.     cout<<"Searching Node 3"<<endl;
  109.     if (searchNode(head, 3)) {
  110.         cout<<"Node 3 is present"<<endl;
  111.     }
  112.  
  113.     cout<<"Searching Node 6 "<<endl;
  114.     if (!searchNode(head, 6)) {
  115.         cout<<"Node 6 is not present"<<endl;
  116.     }
  117.  
  118.     cout<<"Inserting Node 6 after 5 "<<endl;
  119.     head = insertAtPosition(head, newNode(6), 5);
  120.  
  121.     cout<<"Linked List:"<<endl;
  122.     printLinkedList(head);
  123.  
  124.     cout<<"Deleting Node 1"<<endl;
  125.     head = deleteNode(head, 1);
  126.  
  127.     cout<<"Linked List:"<<endl;
  128.     printLinkedList(head);
  129.  
  130.     cout<<"Deleting Node 6"<<endl;
  131.     head = deleteNode(head, 6);
  132.  
  133.     cout<<"Linked List:"<<endl;
  134.     printLinkedList(head);
  135.  
  136.     return 0;
  137. }
  138.  
  139.  
Success #stdin #stdout 0.01s 5464KB
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stdin
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Standard input is empty
stdout
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Linked List:
1 2 3 4 5 
Searching Node 3
Node 3 is present
Searching Node 6 
Node 6 is not present
Inserting Node 6 after 5 
Linked List:
1 2 3 4 5 6 
Deleting Node 1
Linked List:
2 3 4 5 6 
Deleting Node 6
Linked List:
2 3 4 5
https://ideone.com/mgiD2n
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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