Thread: DeleteLast Function of a SinglyLinkedLast

  1. #1
    Registered User
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    Aug 2009
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    36

    DeleteLast Function of a SinglyLinkedLast

    I can't figure out how to fix this. I'm trying to move the pointer all the way to the end of the list but it won't even run. It builds fine, no compiler errors, just doesn't run. It freezes execution.

    Code:
    		void SinglyLinkedList::DeleteLast( ){
    
    			Node* newNode1 = new Node;
    			Node* newNode2 = new Node;
    			Node* deleteNode = new Node;
    
    			newNode1 = first;
    
    			if(Length() == 0)
    				cout << "List is empty." << endl;
    
    			else if(Length() == 1)
    				DeleteFirst();
    
    			else
    				while(newNode1->next != NULL || newNode2->next != NULL){
    					newNode2->next = newNode1->next;
    					newNode1->next = newNode2->next;
    				}
    
    				if (newNode1 == NULL){
    					deleteNode = newNode1;
    					newNode2->next = NULL;
    					delete deleteNode;
    					}
    				else
    					deleteNode = newNode2;
    					newNode1->next = NULL;
    					delete deleteNode;

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
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    Well you shouldn't be calling new at all, you're trying to delete a node, not create three more!

    Then it is
    Code:
    while ( temp->next ) {
      prev = temp;
      temp = temp->next;
    }
    // here, temp is the node to be deleted
    // prev is the node before it (you want to set prev->next to NULL)
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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