Creating Simple Doubly LInked List

 /* CREATING A SIMPLE DOUBLY LINKED LIST */  
 /* DBLINK.C */  
 # include <stdio.h>  
 # include <malloc.h>  
 struct Double  
 {  
      int info;  
      struct Double *next;  
      struct Double *previous;  
 };  
 int num ;  
 struct Double start;  
 void Doubly_link_list (struct Double *);  
 void display (struct Double *);  
 /* Function creates a simple doubly linked list */  
 void Doubly_link_list(struct Double *node)  
 {  
      char ch;  
      start.next = NULL; /* Empty list */  
      start.previous = NULL;  
      node = &start;   /* Point to the start of the list */  
      num = 0;  
      printf("\n Input choice n for break: ");  
      ch = getchar();  
      while( ch != 'n')  
      {  
           node->next = (struct Double *) malloc(sizeof(struct Double));  
           node->next->previous = node;  
           node = node->next;  
           printf("\n Input the values of the node : %d: ", (num+1));  
           scanf("%d", &node->info);  
           node->next = NULL;  
           fflush(stdin);  
           printf("\n Input choice n for break: ");  
           ch = getchar();  
           num ++;  
      }  
      printf("\n Total nodes = %d", num);  
 }  
 /* Display the list */  
 void display (struct Double *node)  
 {  
      node = start.next;  
      do {  
           printf("\n 0x%x", node);  
           printf(" %d", node->info);  
           node = node->next;  
      } while (node->next); /* Show value of last node only one time */  
      do {  
           printf("\n 0x%x", node );  
           printf(" %d", node->info);  
           node = node->previous;  
      } while (node->previous);  
 }  
 void main()  
 {  
      struct Double *node = (struct Double *) malloc(sizeof(struct Double));  
      Doubly_link_list(node);  
      printf("\n Created doubly linked list is as follows\n");  
      display(node);  
 }