//band member struct to hold band member info
struct bandMember
{
  //first name holder
  string firstName;
 
  //last name holder
  string lastName;
 
  //instrument holder
  string instrument;
 
  //pointer to another bandmember
  bandMember *memberPtr;
};
 
//struct to hold bus info
struct bus
{
  //bus designation
  int busNum;
 
  //bus capasity, same for all buses
  int busCap;
 
  //list of bandmembers on each bus
  bandMember *memListPtr;
 
  //pointer to another bus struct
  bus *busPtr;
};

//function prototype
void clearMemory(bus* &ptr);
 
 
//function to clear all pointers
void clearMemory(bus* &pointer)
{
  bus *last, *next;
  bandMember *current, *previous;
 
 
  last = pointer;
  next = last;
  current = last->memListPtr;
  previous = current;
 
  while(last != NULL)
  {
    while(current != NULL)
    {
      previous = current;
      current = current->memberPtr;
      delete previous;
 
    }
    next = last;
    last = last->busPtr;
    delete next;
    current = last->memListPtr;
    previous = current;
 
  }
 
  pointer = NULL;
}