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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. struct Node {
  4.     int data;
  5.     Node* prev;
  6.     Node* next;
  7. };
  8. int main() {
  9.     Node* head = new Node{10, NULL, NULL};
  10.     head->next = new Node{20, head, NULL};
  11.     head->next->next = new Node{30, head->next, NULL};
  12.     head->next->next->next = new Node{40, head->next->next, NULL};
  13.  
  14.     int pos = 0;  
  15.     int value = 25;
  16.     if(pos == 0) {
  17.         Node* newNode = new Node{value, NULL, head};
  18.         head->prev = newNode;
  19.         head = newNode;
  20.     }
  21.     else {
  22.         Node* temp = head;
  23.         int i = 0;
  24.         while(i < pos-1 && temp->next != NULL) {
  25.             temp = temp->next;
  26.             i++;
  27.         }
  28.         Node* newNode = new Node{value, temp, temp->next};
  29.         if(temp->next != NULL) {
  30.             temp->next->prev = newNode;
  31.         }
  32.         temp->next = newNode;
  33.     }
  34.     Node* t = head;
  35.     while(t != NULL) {
  36.         cout << t->data << " ";
  37.         t = t->next;
  38.     }
  39.  
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0.01s 5324KB
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stdin
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Standard input is empty
stdout
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25 10 20 30 40
https://ideone.com/KZ8mWQ
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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