void CD::create_cd () {
start_ptr = NULL;
temp = new DVD;

 cout << "\nPlease enter the title of the CD: "; 
 cin >> temp->title; 
 
 temp->next = NULL; 
 // Set up link to this node 
  if (start_ptr == NULL) 
  {start_ptr = temp;}
    else 
    {temp2 = start_ptr; 
  while (temp2->next != NULL) { temp2 = temp2->next; } 
  temp2->next = temp; }
 
}
 

void CD::list()
{
do 
  {  if (temp == NULL)
       cout << "End of list" << endl;
     else
       { 
  cout<<"Title: "<<temp->title<<endl;

          // Move to next node (if present)
          temp = temp->next;   //this should make temp=NULL eventually
       }
  }
while (temp != NULL);  //Problem here!!!
 
}

class DVD 
{ 
private: 
string title, actor;
 
string *ptr;
int num;
 
DVD *start_ptr ; 
DVD *temp, *temp2,*temp3; // Temporary pointers
DVD *current;
 
 
DVD *next;
public: 
void create_dvd();  // sets names of actors to the DVD 
void list();   // sets title of the DVD 
 
 
}; 
 
void DVD::create_dvd () {
 
start_ptr = NULL;
temp = new DVD;
 cout<<"How many movies would you like to enter? ";
 cin>> num;
 cin.ignore();
 //ptr = new string[num];
 
 
DVD *current = start_ptr; //A working pointer into the linked list.
 
 
 
  if ( ptr == 0 )
    cout << "Error: memory could not be allocated";
  else 
  {
    for ( int a = 0; a < num; a++ ) 
 {
 cout << "\nPlease enter the title of the DVD : "; 
 cin >> temp->title; 
 
 temp->next = NULL; 
 // Set up link to this node 
  if (current == NULL) 
  {start_ptr=temp;}
    else 
    {  
  while (current->next ) { current = current->next; } 
  current->next = temp; 
    }
 
 }
  }
 
    return; 
 
}
 
 
void DVD::list()
{
 
DVD *current=start_ptr;
 
 
while (current); 
       { 
  cout<<"Title: "<<current->title<<endl;
           // Move to next node (if present)
          current=current->next;
       }
cout << "End of list!" << endl;
    return; 
 
 
}

void DVD::list()
{
 
DVD *current=start_ptr;
 
 
while (current);
       {

DVD() : num(0), next(0) {};