inserthead.cpp

#include <iostream>

using namespace std;

class Node
{
public:
    int data;
    Node *next;

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

Node *UserData()
{
    int data;
    cout << "enter data:  " << endl;
    cin >> data;
    Node *head = NULL;
    Node *tail = NULL;

    while (data != -1)
    {
        Node *n = new Node(data);
        if (head == NULL)
        {
            head = n;
            tail = n;
        }
        else
        {
            n->next = head;
            head = n;
        }
        cout << "enter data:  " << endl;
        cin >> data;
    }
    return head;
}
int main()
{
    Node *head = UserData();
    print(head);
    return 0;
}