Insert new node at head of linked list.

insertAtHead.cpp

#include<bits/stdc++.h>
using namespace std;

class Node{
    public:
        int data;
        Node* next;
        Node(int data){
            this->data = data;
            this->next = NULL;
        }
};

void insertAtHead(Node **head, int data){
    Node* newNode = new Node(data);
    newNode->next = *head;
    *head = newNode;
}

void printLL(Node **head){
    Node *temp = *head;
    while(temp!=NULL){
        cout<<temp->data<<" ";
        temp = temp->next;
    }
    cout<<endl;
}

int main(){
    Node* head = new Node(5);
    insertAtHead(&head,3);
    insertAtHead(&head,6);
    printLL(&head);
}