typdef struct 
{int next;
person data[500];
}per;
void init(per *a)
{a->next=0;}
int add_person(person *p,per *Db)
{
copy_person(Db->data+Db->next,p);
return (++Db->next);
}
void copy_person(person *dest,person *source)
{
strncpy(dest->first,source->first,20);
strncpy(dest->last,source->lat,20);
strncpy(dest->address,source->address,20);
dest->tel=source->tel;
dest->num=source->num
}