#include<stdio.h>

#include<stdlib.h>

struct node

{

    int data;

    struct node *next;

}*head=NULL;

int main()

{

    struct node *node1;

       node1=malloc(sizeof(struct node));

    node1->data = 10;

    struct node *node2;

       node2=malloc(sizeof(struct node));

    node2->data = 20;

    struct node *node3;

      node3=malloc(sizeof(struct node));

    node3->data = 30;

    struct node *node4;

      node4=malloc(sizeof(struct node));

    node4->data = 40;

    head = node1;

    node1->next = node2;

    node2->next = node3;

    node3->next = node4;

    node4->next = NULL;

    struct node *temp;

    temp = head;

    while(temp != NULL)

    {

        printf("%d-->",temp->data);

        temp = temp->next;

    }

    printf("NULL");

    return 0;

}