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Assigning null to an object in the linked list gives error


Assigning null to an object in the linked list gives error

By : user2954891
Date : November 22 2020, 10:33 AM
I wish this helpful for you You are assigning null to temp.previous.next, but nowhere do you check that temp.previous is not null.
Further, you initialize temp with first, which presumably (being "first") has no previous node - ie temp.previous would probably be null.
code :


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Error while assigning value to member-variable after declaring the object null

Error while assigning value to member-variable after declaring the object null


By : user3746548
Date : March 29 2020, 07:55 AM
Hope this helps Variable names are only references. They point to a space in memory (in the heap) which contains an object.
When you do MyObj myObject = new MyObj();, it does two things: create the object in memory, and point the myObject reference to it. So when you do myObject.sections, it follows the reference, and check the sections part of your object in memory.
Null Reference Error when directly assigning a List object to an PagedList

Null Reference Error when directly assigning a List object to an PagedList


By : user3065739
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further KeyMaster Model , Your code as I understand it:
code :
KeyMasterViewModel keyMasterViewModel = new KeyMasterViewModel();
[...]
keyMasterViewModel.pagedkeymodel.pagedkeymaster = KeyMasterModelObject;
Linked List: Segmentation fault error when assigning a value to the next part of a node

Linked List: Segmentation fault error when assigning a value to the next part of a node


By : Deepthi Pullarkat
Date : March 29 2020, 07:55 AM
help you fix your problem The first clue that something might be wrong would be here, in insert():
code :
newptr = new Node(val);
predptr = new Node();
Node * newptr=new Node(val);

Node **predptr=&first;

while ( (*predptr) && pos)
{
    predptr= & (*predptr)->next;
    --pos;
}

newptr->next= *predptr;
*predptr=newptr;
Assigning NULL to the head node in a linked list in C

Assigning NULL to the head node in a linked list in C


By : Hank
Date : March 29 2020, 07:55 AM
I hope this helps . You're already changing the value of head in your append function so you basically need to do the same thing in freeList:
code :
void freeList(struct Node **head_ref) 
    { 
    struct Node *tmp,*node;
    node=*head_ref;
    while (node != NULL) 
        { 
        tmp=node;
        node = node->next; 
        //printf("  ..Free %d \n", tmp->data);      
        free(tmp);
        } 
    *head_ref=NULL;
    }

int main (){
    /* do stuff */
    freeList(&head);
    /* do stuff */
    }
When deleting the last node in linked-list, i am assigning temp to null, but it's still there and not deleted. Java

When deleting the last node in linked-list, i am assigning temp to null, but it's still there and not deleted. Java


By : user3245028
Date : March 29 2020, 07:55 AM
around this issue You are not deleting the node in the snippet you wrote in the OP. You are just assigning null to temp.
code :
    if (!isEmpty()) {
        Node temp = first;
        Node previousNode = null;
        while (temp.next != null) {
            previousNode = temp;
            temp = temp.next;
        }
        previousNode.next = null;
    }
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