I can't get out of my while loop!!

[panfilero]

OK, I wrote this program to try and learn about linked lists, basically if you run it, it asks you to input a name, and after you hit enter, it asks you to type 1 if you want to input another name or 0 if you don't.

If you put in a few names then hit 0 it should return the list of names you put in. But it doesnt. It works fine if you only input 1 name then hit 0 after that, but for more than one name it gets stuck.

It's stuck in the while( response ) portion of my code... but to me the while loop looks fine, if you input 0 it should exit the loop, but it doesn't... Can anyone tell why it doesn't exit? thank you

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

/* declare a self-referential structure */

typedef struct elephant {
        char  name[1];
        struct elephant* next;
        }ELEPHANT;
        
void    print_elephants( const ELEPHANT* ptr );
ELEPHANT* get_elephants(void);

main()
{
      ELEPHANT* start;
      start = get_elephants();
      print_elephants( start );
      getchar();
      getchar();
      return EXIT_SUCCESS;
          }

/* get_elephants allocates run-time storage for nodes.  It builds
   the linked list and stores user-supplied names in the name 
   members of the nodes. It returns a pointer to the first such
   node. */
   
ELEPHANT* get_elephants(void)
{
          ELEPHANT *current, *first;
          int response;
          
          /* allocate first node */
          current = first = malloc( sizeof ( ELEPHANT ) );
          
          /* store name of first elephant */
          printf( "\n\n\tNAME:\t" );
          scanf( "%s", current -> name );
          
          /* prompt use about another elephant */
          printf( "\n\n\n\tAdd another? (1 == yes, 0 == no)\t" );     
          scanf( "%d", &response );
          
          
          /* Add elephants to list until user signals halt. */
          while ( response ) {
                /* try to allocate another elephant node */
          if ( ( current -> next = 
               malloc( sizeof ( ELEPHANT ) ) ) == NULL ) {
               printf( "Out os memory\nCan't add more elephants\n");
               return first;
               }
               
               current = current -> next;
               
               /* store name of next elephant */
               printf( "\n\n\tNAME:\t" );
               scanf( "%s", current -> name );
               
               /* prompt user about another elephant */
               printf( "\n\n\n\tAdd another? ( 1 == yes, 0 == no)\t" );
               scanf( "d", &response );
               }
               
               /* set link in last node to NULL */
               current -> next = NULL;
               return first;
               
               }
               
           
               
               /* print_elephants steps through the linked list pointed to by
               ptr and prints the member names in each node as well as the
               position of teh node in the list */
               
               
          void print_elephants( const ELEPHANT* ptr )
          {
               int count = 1;
               printf( "\n\n\n" );
               while ( ptr != NULL ) {
                     printf( " \nElephant number %d is %s.", 
                     count++, ptr -> name );
                     ptr = ptr -> next;
                     }
                     }

i've tried while ( response == 1 ) .... it still gets stuck

[kalium]

               /* prompt user about another elephant */
               printf( "\n\n\n\tAdd another? ( 1 == yes, 0 == no)\t" );
               scanf( "d", &response );

change the

 scanf( "d", &response );

to

 scanf( "%d", &response );

[panfilero]

God Bless you.