What is the Function of Converting Doubly Link List into Circular Link List.Write a programm to convert Doubly Link List into Circular Link List

#include<stdio.h>

#include<conio.h>

#include<alloc.h>

struct node

{

 int data;

 struct node *prev;

 struct node *next;

};

void append(struct node **q)

{

 struct node *temp;

 temp=*q;

 if(temp==NULL)

 {

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

  scanf("%d",&(*q)->data);

  (*q)->next=NULL;

  (*q)->prev=NULL;

 }

 else

 {

   while(temp->next!=NULL)

    temp=temp->next;

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

    temp=temp->next;

  scanf("%d",&temp->data);

   temp->next=NULL;

   temp->prev=NULL;

   }

}

void display(struct node *q)

{

 struct node *temp;

  temp=q;

   while(temp!=NULL)

    {

     printf(" %d",temp->data);

      temp=temp->next;

    }

    getch();

}

void append2(struct node **q)  //DLL to CLL

{

 struct node *temp;

 temp=*q;

  while(temp!=NULL)

  temp=temp->next;

   temp->next=(*q);

}

void display2(struct node *q)

{

 struct node *temp;

  temp=q;

   while(temp->next!=q)

    {

     printf(" %d",temp->data);

      temp=temp->next;

    }

    getch();

}

void main()

{

 struct node *start;

 start=NULL;

 clrscr();

 printf("\nenter the Doubly Link List");

  append(&start);

  append(&start);

  append(&start);

 printf("\nthe Following Doubly Link List");

  display(start);

  append2(&start);

  printf("\nList After Conversion Circular Link List");

  display2(start);

 getch();

}

The following will be the output :

DLL to SLL