Insert new node at tail of Linked List

insertAtTail.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 insertAtTail(Node **head, int data){
    Node *temp = *head;
    Node *newNode = new Node(data);
    while(temp->next!=NULL){
        temp = temp->next;
    }
    temp->next = 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);
    insertAtTail(&head,7);
    insertAtTail(&head,9);
    printLL(&head);
}