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main.c

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

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

typedef struct node Node;
Node* head;

int main()
{
    head=NULL;

    Node* temp1=(Node*)malloc(sizeof(Node));
    Node* temp2=(Node*)malloc(sizeof(Node));
    Node* temp3=(Node*)malloc(sizeof(Node));
    Node* temp4=(Node*)malloc(sizeof(Node));

    temp1->data=5;
    temp1->prev=NULL;
    temp1->next=temp2;

    temp2->data=6;
    temp2->next=temp3;
    temp2->prev=NULL;

    temp3->data=7;
    temp3->prev=temp4;
    temp3->next=NULL;

    temp4->data=8;
    temp4->next=NULL;
    temp4->prev=NULL;

    head=temp1;

    Node* tempX=(Node*)malloc(sizeof(Node));
    Node* tempY=(Node*)malloc(sizeof(Node));

    tempX=head;
    tempY=head;

    while(tempX!=NULL || tempY!=NULL)
    {
        printf("%d",tempX->data);
        tempX=tempX->next;
        tempY=tempY->prev;
    }
}