[Dev-C++] Single Linked List-IV

[<and...@su...>]

Dear users,
   Please consider this (modificated) Single Linked List Code:


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

#define MAX 5

struct address
{
   char name[40];
   char phone[20];
   struct address *next;
};

void slstore(struct address *, struct address **, struct address **);
void display(struct address *);
void list(struct address **);
void init(struct address **);

int main()
{
   struct address *info=NULL, *start=NULL, *last=NULL;
   int i;

   for(i=0; i<MAX; i++)
   {
      init(&info);
      printf("Enter name: ");
      gets(info->name);
      printf("Entre com phone: ");
      gets(info->phone);
      slstore(info, &start, &last);
   }
   printf("List Recorded:\n");
   list(&start);
   while (start)
   {
      info = start;
      start = start->next;
      free(info);
   }
   system("PAUSE");
   return(0);
}

void slstore(struct address *i, struct address **start_arg,
             struct address **last_arg)
{
   if(*last_arg==NULL) *start_arg=i;
   else (*last_arg)->next=i;
   i->next=NULL;
   *last_arg=i;
}

void display(struct address *info)
{
   printf("Actual address-->%p\n", info);
   printf("%s\n", info->name);
   printf("%s\n", info->phone);
   printf("Next address-->%p\n", info->next);
   printf("\n");
   system("PAUSE");
}

void list(struct address **start_arg)
{
   struct address *info;

   init(&info);
   info = *start_arg;
   while(info)
   {
      display(info);
      info = info->next;
   }
}

void init(struct address **arg)
{
   *arg= malloc(1*sizeof(struct address));
   if(!(*arg))
   {
      printf("sem memória\n");
      system("PAUSE");
      exit(EXIT_FAILURE);
   }
}

==>My questions:
A) One example of addresses that are printed on the screen are:
   002224C8
   00222510
   00222558
   002225A0
   002225E8
   The distance between theese addresses is 72 bytes, not 64 as expected
   because the size of the struct address.
   WHY?

B) Could the final loop:
   while (start)
   {
      info = start;
      start = start->next;
      free(info);
   }
   be changed by a function call for a function like

   free_ptr(&start);

   void free_ptr(struct address **arg)
   {
      struct address *info=NULL;

      while (*arg)
      {
         info = *arg;
         *arg = (*arg)->next;
         free(info);
      }
   }

Thanks
Andre