Doubly Linked List Program in C

 /* Doubly linked list */  
 /* This program seg,ent creates a doubly linked list then prints in forward and backword */  
 /* Double_l.c */  
 #include <stdio.h>  
 #include <malloc.h>  
 void main(void)  
 {  
      int i;  
      struct ListEntry {  
           int number;  
           struct ListEntry *next;  
           struct ListEntry *previous;  
      } start, *node;  
      start.next = NULL; /* Empty list */  
      start.previous = NULL;  
      node = &start;   /* Point to the start of the list */  
      for (i = 1; i <= 10; i++)  
      {  
           node->next = (struct ListEntry *) malloc(sizeof(struct ListEntry));  
           node->next->previous = node;  
           node = node->next;  
           node->number = 50+i;  
           node->next = NULL;  
      }  
      /* Display the list */  
      node = start.next;  
      do {  
           printf("%d ", node->number);  
           node = node->next;  
      } while (node->next); /* Show 60 only one time */  
      do {  
           printf("%d ", node->number);  
           node = node->previous;  
      } while (node->previous);  
 }