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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. class Node{
  5. public:
  6.     int data;
  7.     Node *next;
  8.     Node(int x=0){
  9.         this->data = x;
  10.         this->next = nullptr;
  11.     }
  12. };
  13. class LinkedList{
  14. private:
  15.     Node *HEAD;
  16. public:
  17.     LinkedList(){
  18.         HEAD=nullptr;
  19.     }
  20.     void insertAtFirstPosition(int x){
  21.         Node *newNode = new Node(x);
  22.         newNode->next = HEAD;
  23.         HEAD = newNode;
  24.     }
  25.     void insertAtAnyPosition(int key, int k){
  26.       if(k<1){
  27.         cout << "Invalid Position"<<endl;
  28.         return;
  29.       }
  30.       Node *newNode = new Node(key);
  31.       if(k==1){
  32.         newNode ->next=HEAD;
  33.         HEAD=newNode;
  34.         return;
  35.       }
  36.       int counter = 1;
  37.       Node *current;
  38.       current = HEAD;
  39.       while(current != nullptr && counter <(k-1)){
  40.         current = current->next;
  41.         counter++;
  42.       }
  43.       if(current == nullptr){
  44.         cout << "Invalid Position"<<endl;
  45.           delete newNode;
  46.           return;
  47.       }
  48.       newNode->next=current->next;
  49.       current->next=newNode;
  50.       return;
  51.  
  52.     }
  53.     void print(){
  54.         Node *current;
  55.         current = HEAD;
  56.         while(current!=nullptr ){
  57.             cout<<current->data;
  58.             cout<<" -> ";
  59.             current = current->next;
  60.         }
  61.         cout<<" NULL"<<endl;
  62.     }
  63. };
  64. int main()
  65. {
  66.     LinkedList myList;
  67.     myList.insertAtFirstPosition(2);
  68.     myList.print();
  69.     myList.insertAtAnyPosition(3,2);
  70.     myList.print();
  71.     myList.insertAtAnyPosition(10,3);
  72.     myList.print();
  73.     myList.insertAtAnyPosition(5,2);
  74.     myList.print();
  75.     myList.insertAtAnyPosition(15,12);
  76.     myList.print();
  77.     return 0;
  78. }
  79.  
  80.  
  81.  
  82.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
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Standard input is empty
stdout
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2 ->  NULL
2 -> 3 ->  NULL
2 -> 3 -> 10 ->  NULL
2 -> 5 -> 3 -> 10 ->  NULL
Invalid Position
2 -> 5 -> 3 -> 10 ->  NULL
https://ideone.com/6qmvOO
language:
C++ (gcc 8.3)
created:
10 hours ago
visibility:
public

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