Write a programm to add node in the begining of Doubly Link List

#include<stdio.h>

#include<conio.h>

#include<alloc.h>

struct node

{

int data;

struct node *prev,*next;

};

void last(struct node **q)

{

 if(*q==NULL)

 {

  *q=(struct node*)malloc(sizeof(struct node));

  printf("\nlist is empty\nEnter the data in node :");

  scanf("%d",&(*q)->data);

  (*q)->prev=NULL;

  (*q)->next=NULL;

 }

else

 {

 struct node *temp;

 temp=*q;

 temp->prev=(struct node*)malloc(sizeof(struct node));

 temp=temp->prev;

 temp->next=(*q);

 (*q)->prev=temp;

 temp->prev=NULL;

  printf("\nenter the data in the Begining : ");

  scanf("%d",&temp->data);

 (*q)=temp;

 }

 printf("\nnode is created successfully!!");

}

void display(struct node *q)

{

 struct node *temp;

  temp=q;

  printf("\nnow the list is : ");

 while(temp!=NULL)

 {

  printf(" %d",temp->data);

  temp=temp->next;

 }

}

void main()

{

 struct node *start;

 struct node **q;

  clrscr();

 start=NULL;

 last(&start);

 last(&start);

 last(&start);

 last(&start);

 display(start);

getch();

}