#include<stdio.h>
#include<stdlib.h>

typedef struct node{
    int data;
    struct node *next;
    struct node *prev;
    
}Node;

void creation(int num){
    Node *newnode =(Node*) malloc(1 *sizeof(num));
    newnode -> data = num;
    newnode -> next = NULL;
    newnode -> prev = NULL;
    if(head=NULL){
        head = newnode;
        tail = newnode;
        
    }
    else{
        tail -> next = newnode;
        newnode ->prev = tail;
        tail = newnode;
        
    }
}
void display(int sum,int pos){
    Node *itr,*sum=0;
    Node *temp = head;
    for(itr =  head;ind!=NULL;ind=ind->next){
        
    }
}