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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. struct Node {
  5.     int data;
  6.     Node* prev;
  7.     Node* next;
  8. };
  9.  
  10. int main() {
  11.     Node* head = new Node{10, NULL, NULL};
  12.     head->next = new Node{20, head, NULL};
  13.     head->next->next = new Node{30, head->next, NULL};
  14.     head->next->next->next = new Node{40, head->next->next, NULL};
  15.  
  16.     int pos = 2, value = 25;
  17.  
  18.     Node* temp = head;
  19.     for(int i = 0; i < pos-1; i++){
  20.         temp = temp->next;
  21.     }
  22.  
  23.     Node* newNode = new Node{value, temp, temp->next};
  24.     if(temp->next) temp->next->prev = newNode;
  25.     temp->next = newNode;
  26.  
  27.     for(Node* t = head; t; t = t->next)
  28.         cout << t->data << " ";
  29.  
  30.     return 0;
  31. }
  32.  
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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10 20 25 30 40
https://ideone.com/9lZPzn
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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