Creating new linked list

[GGWPBOT]

Hello, i am struggling with creating linked lists that are linked to the head list, I know how to create the head list but how can i link the others with it
help please
here is my code

 void Push(ItemType x)
	{
		if (IsFull())
		{
			cout << "Stack is full";
			return;
		}
		if (topPtr == NULL)
		{
			topPtr = new NodeType<ItemType>;
			topPtr->info = x;
			topPtr->next = NULL;
			tailPtr = topPtr;
			top++;
			stackLength++;
		}
		else
		{
			temp = new NodeType<ItemType>;
			temp->info = x;
			tailPtr->next =temp;
			temp->next = NULL;
			tailPtr = temp;
			top++;
			stackLength++;
		}
	};

[Ganado]

What is tailPtr when the else branch is reached? If it's NULL, you're dereferencing a null pointer on line 21 with tailPtr->next. Also, you have both tailPtr->next and tailPtr itself being set to temp. Is that what you want? Also, since you have a tailPtr, wouldn't its "next" always be NULL?

It's hard to tell, but maybe something like this is what you want? Not sure if this will help.

		else
		{
			temp = new NodeType<ItemType>;
			temp->info = x;
                        temp->next = NULL;
                        tailPtr = temp;
			top++;
			stackLength++;
		}

Basically the same as the if branch, but working with the temp isntead of head.