#include <iostream>

using namespace std;

class Node {
public:
    int data;
    Node *next;
    Node() {
        cout << "Node object is being created" << endl;
    }
};

void printList(Node *node) {
    while(node != NULL) {
        cout << node->data << ",";
        node = node->next;
    }
    cout << endl;
}

void push(Node **node, int data) {

    // // working V1 start
    // Node *newNode = new Node();
    // newNode->data = data;
    // newNode->next = *node;
    // *node = newNode;
    // // working V1 end

    // not working V2 start
    Node newNode;
    newNode.data = data;
    newNode.next = *node;
    *node = &newNode;
    // not working V2 end

}

int main() {
    Node *a = NULL;

    push(&a, 15);
    push(&a, 10);

    printList(a);

}