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  1. // Reverse a linked list using Stack
  2. #include <iostream>
  3. #include <stack>
  4. using namespace std;
  5. class Node {
  6. public:
  7.     int data;
  8.     Node* next;
  9.       Node(int x) {
  10.         data = x;
  11.          next = NULL;
  12.     }
  13. };
  14. void reverseLL(Node** head)
  15. {
  16.     stack<Node*> s;
  17.     Node* temp = *head;
  18.     while (temp->next != NULL) {
  19.         // Push all the nodes in to stack
  20.         s.push(temp);
  21.         temp = temp->next;
  22.     }
  23.     *head = temp;
  24.     while (!s.empty()) {
  25.         temp->next = s.top();
  26.         s.pop();
  27.         temp = temp->next;
  28.     }
  29.     temp->next = NULL;
  30. }
  31. void printlist(Node* temp)
  32. {
  33.     while (temp != NULL) {
  34.         cout << temp->data << " ";
  35.         temp = temp->next;
  36.     }
  37. }
  38. void insert_back(Node** head, int value)
  39. {
  40.     Node* temp = new Node(value);
  41.     temp->next = NULL;
  42.     if (*head == NULL) {
  43.         *head = temp;
  44.         return;
  45.     }
  46.     else {
  47.         Node* last_node = *head;
  48.         while (last_node->next != NULL)
  49.             last_node = last_node->next;
  50.         last_node->next = temp;
  51.         return;
  52.     }
  53. }
  54. int main()
  55. {
  56.     Node* head = NULL;
  57.     insert_back(&head, 347);
  58.     insert_back(&head, 247);
  59.     insert_back(&head, 147);
  60.     insert_back(&head, 47);
  61.     insert_back(&head, 4);
  62.     cout << "Given linked list\n";
  63.     printlist(head);
  64.     reverseLL(&head);
  65.     cout << "\nReversed linked list\n";
  66.     printlist(head);
  67.     return 0;
  68. }
  69. // mam iam just tried these programs as per the w3schools if i revised the previoous topics i can make it in efective way please provide the recording of week 2-2 session mam
Success #stdin #stdout 0.01s 5296KB
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stdin
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Standard input is empty
stdout
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Given linked list
347 247 147 47 4 
Reversed linked list
4 47 147 247 347
https://ideone.com/ktKG78
language:
C++14 (gcc 8.3)
created:
19 days ago
visibility:
public

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