C++ :: Deleting Middle Node In Linked List

May 1, 2013

I am trying to delete a node from the end of a Linked List but I have some problems. Every node has it's unique code. Here is what I do:

1. Ask the user for the unique code of the node.
2. Ask him if he wants to change the data in it or delete the whole node.
3. If he chooses to delete it, I do this:

//let's say that temp1 points to the node
List *temp2 = temp1;
temp1 = temp1->next;
delete temp2;

And it's just not deleting the node.

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C :: Deleting A Node From Linked List

Apr 19, 2013

I have a struct with some select student information. My wish is to be able to have the user type in a surname from the list, and for that entry to be deleted. However I am slipping up for some reason.

Here is the start of my program showing my struct:

Code:
#include <stdio.h>
#include <string.h>
#define NAME_LEN 30
#define LINE_LEN 80
struct record {

[Code] ....

I get the following errors in my while loop as well as the if statement below that loop:

-invalid operands to binary !=
-invalid type of argument '->'

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C++ ::  linked List - Deleting A Node

Mar 2, 2013

If p is a pointer pointing a node to be deleted, then what's wrong in the following code:

cout << "Do you want to delete this record? (y/n) ";
if (getch() == 'y' || getch() == 'Y'){// Delete record.
if (p == *ph){//If first node is to be deleted.
*ph = (*ph)->next;
delete p;

[Code] .....

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C++ :: Deleting Nth Node From Doubly Linked List

Sep 19, 2013

I need to delete the Nth node from a doubly linked list. I know I just cant delete it out right. I have all the goodies including a templetized node class. This is the code we're given:

template <typename T>
void doublyLinkedList<T>::deleteKthElement(const int item) {
}

It accepts an int, and should go to the Nth node and delete it.

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C++ :: Deleting Head Node In Linked List

Sep 8, 2014

I would like my function to return the data that was deleted. I have this code at the moment, where value_type is just an alias for int at the moment:

node::value_type linkedlist::removeFromHead(){
node* temp_head;
node::value_type data;
data = head_ptr->getData();

[Code] .....

When I try to use this function though, I get a segfault.

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C++ :: Deleting Node From End Of A List

May 5, 2013

I'M TRYING TO DELETE FROM THE END OF A LINKLIST...Actually I delete the last node but the problem is that I lost the end of the list, in other words my list leaved of pointing to NULL.I really don't know how to fixed, (it was more easy to delete from head)

Code :

void linkedstack::pop() {
if(head==NULL){
cout<<"The linklist is empty"<<endl;
return;}
else {
node *current=head;

[code]....

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C :: Adding To Middle Of Linked List

Feb 17, 2013

I'm trying to make a function that lets me pass an index and a string and will insert the string at that index in the linkedlist..

Code:

typedef struct node {
char* value;
struct node* next;
}

[code].....

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C++ :: Deleting A Linked List?

Mar 27, 2014

If I have a linked list, how can I delete it at the end of my program to free the memory taken up. I know I have to use delete but not sure how to use it in this case.

Here is the code that I have:

#include <iostream>
#include <cstdlib>
using namespace std;
struct Numlist {
int num; //Number
Numlist * next; //Pointer to the next node

[code]....

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C/C++ :: Add Node In Linked List?

Dec 5, 2014

I create A program that will Add and Display the Link List but I have problem on it. If I add it will inserted in the prev node not in the next node. Here's my source code.

#include <stdio.h>
typedef struct Member {
int id;
char name[256];
struct Member *next;

[Code] ....

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C++ :: Deleting Linked List Nodes Recursively

Jun 25, 2014

I am creating a Linear linked list in c++. I've written all the functions for it, but now I want to try and do them using recursion.

I managed to make functions for adding and displaying nodes on the list, but I am stuck on the function for removing nodes. First I want to try and write a function the removes the last item on the list. But for some reason my code isn't working properly.

Here is the code :

void removeLastItem(node * &head) {
if(!head) {
delete head;
head = NULL;

[Code] ....

NODE - My structure name
NEXT - The pointer to next element.
HEAD - The first (head) pointer.

The couts in the if statements are just for testing. In fact after I Run my program it does as it is supposed - enters the second if /b]case as many times as there are elements and then executes the first [b]if statement. But for some reason it does not delete the actual node.

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C :: Handling Linked List Node Add At End?

May 17, 2014

This is what I have at the moment which works as I would like but wondering if there is a better way of handling? Currently just making sure I know linked-lists well enough.

Code:

void push_to_end( node_t * headRef, int val ) {
node_t * tail = headRef;
node_t * new_node = malloc( sizeof ( node_t ));
while( headRef != NULL ) {

[Code].....

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C :: Linked List - Allow User To Add A New Node

Aug 12, 2013

I'm trying to impliment a simple singly linked list, then allow a user to add a new node. I have mocked up a siimple example to illustrate my point using Linked Lists...

Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct node {
int x;
struct node *next;

[Code] ....

So I have done things similatr to this in C# and Java but not in C. There maybe some parts of this I'm sure some will disagree with in terms of buffers,overflow etc. but it's just the linked list part that I am interested in at the moment, I am only doing it like this because when it works, I will be extracting the working linked list stuff into another program that can deal with its I/O etc.

I have tried to comment as best I can to demonstarte my intentions and understandings per line of code. The add function needs to add a node of value x that the user has input, and add that to the end of the list - I'm sure that the print function is not doing all its supposed to do...

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C++ :: Linked List - Implementation At Nth Node

Feb 27, 2015

I have to write a program which has the user be able to enter a specific value at a specific position of the linkedlist, replacing that node with the user defined value

EX: Enter the value 5 at 2nd node, which will override the old value at the 2nd node with the new one

I am getting a compiler error which terminates my program right after the user presses the return key after he/she has given a position to change the value

Error: Unhandled exception at 0x013C50C1 in Linked(1).exe: 0xC0000005: Access violation reading location 0x0000812B.

I am not going to show the whole code as the problem resides solely on the insert function:

void TheNode::insert(double num, int choice) {
int post = 0;
MyNode *ptr = new MyNode;
(*ptr).value = num;
MyNode *previous = head;
MyNode *current = head->next;

[Code] .....

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C++ :: Append Node To A Linked List

Jan 27, 2013

I have a function that append node to a linked list like this:

struct ListNode{
int value;
struct ListNode* next;
};
void appendNode(struct ListNode* head, int num){

[code] ....

when I use it, the head in main() does not change its address and it's still pointing to NULL. Why??

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C++ :: Should Delete Every Node In Linked List?

Jul 10, 2014

Still toying with my self-coded linked list class and now another question: should I delete each node of my class with the delete in the class destructor or is it done automatically when the main() function ends?

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C++ :: Linked List Remove Node

Oct 24, 2014

How to remove node from linked list. I am trying to implement this in a file record to remove data from struct..I dont know how addressing in linked list work for structs;

#include <iostream>
#include<fstream>
#include<cstring>
#include<cstdlib>

using namespace std;
struct node{
int val;

[Code] ....

segmentation fault

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C :: Linked List Insert Node Between Two Nodes

Oct 25, 2013

I have a problem with inserting a node between two nodes.

Code:
#include <stdio.h>
#include <stdlib.h>
struct listelem {
int nbr;
struct listelem *next;

[Code] ....

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C :: Adding A Second Node To A Doubly Linked List

Mar 6, 2015

I am having trouble adding a second node to a doubly linked list. I define my list as follows:

Code:

typedef struct Node {
char command[256];
int length;
struct Node *prev;
struct Node *next;
} userInput;
}

[code]...

Now, when I iterate back through my list (I want to start at the tail and work my way towards the head), I can only ever get the 1st node to print, then the 2nd node is garbage, which means, to me, that I've linked something wrong.

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C :: Sorting A Linked List Upon Node Insertion

Aug 30, 2013

While I know that linked lists seem to be a fairly common problem area among beginner C programmers, most examples that I have come across abstract the sorting of a linked list to a separate function which is sadly not what I am trying to do.

The code below is my attempt to have the nodes inserted into their correct place so that once all nodes have been inserted they are already in a sorted order.

Code:

int main(int argc, char *argv[])
{
struct node_t* dict_head;
struct node_t* traversor;
struct node_t* newnode;
int list_size = 0, insert_key, search_key, delete_key, x;
char insert_word[WORDLEN];
/*Opening the dictionary file provided by the command line argument */
FILE *fp;
fp = fopen(argv[1], "r");

[Code]....

The problem is as follows. When you provide it with input in which the first word scanned is any other word than that which would be placed at the front of the list, it works as intended. For example.

7 world
0 ant
3 kodak
1 best
6 the
2 is

Produces ant -> best->is->kodak->best->world

However, swapping ant and world in the above input gives:
world->best->is->kodak->best->world

In regards to why I have my head node set as a node without a word or a key, it was suggested that I make it so that the first node inserted is set to be the head of the list and then changed as sorting required, yet this caused only additional problems.

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C :: Delete A Node From Singly Linked List

Oct 18, 2014

I was trying to write a function in C to delete a node(only from the middle) from a Singly Linked List. I wrote one but not sure if the code will work fine under all test conditions. I have tested it and shows no error so far.

Code:
void deleteAt(struct node *root, int number){
while(root->link != NULL) {
if(root->link->item == number) //checks if the next node is the element to be deleted {
root->link = root->link->link; //points the link of the element to be deleted to the element before the element to be deleted
}
else
root = root->link;
} }

Or is there a better way to do this?

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C++ :: Doubly Linked List With Head Node

Oct 17, 2014

i am trying to develop a doubly linked list class. I became stuck at a few of the functions as well as the main.cpp file. i have to insert a character sentence "TRICK OR TREAT" spaces included. I am stuck on the display and the listsize functions and im unsure if my insert has the head node in it. The function parameters were given to us and most of this code was given from a single linked list.

//node.h
#pragma once
class Node
{
publi

[Code].....

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C++ :: Linked List Class Node Implementation

Mar 26, 2014

I am studying this sample code for linked list class node implementation. I am not 100% sure how this code keeps track of the head node. Here's what I know so far, and if you want to add/correct anything feel free to do so:

class Node {
public:
Node(); // constructor of class node without arguments
Node(int, Node*); //constructor with arguments of int type and a pointer node type
Node* next() const;
void setNext(Node*); //member fun, returning a pointer of node type
void setKey(int);

[Code] ......

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C++ :: Pointer To Last Node Of A Doubly Linked List

Nov 30, 2014

Why is it sufficient to only have a pointer to the last node of a doubly linked list?

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C++ ::  Sum Up Price Element In Node Of Linked List?

Sep 6, 2014

I'm trying to calculate the total price of books contained in a linked list. I've tried getTotal() function in linked list but error: no match for 'operator+=' in 'total += ptr->Node<Book>::info'| occurred. How can I access the price in the node and then calculate the total price.

Here is part of my code :

Book class
class Book {
protected :
int id;
string title;
double price;
string bookStatus;

[code]....

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C/C++ :: Pointer To Last Node Of A Circular Linked List

Nov 30, 2014

Why is it sufficient to only have a pointer to the last node of the list?

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C/C++ :: Freeing Linked List Node With Pointer?

Mar 30, 2015

I'm having a bit of an issue here. I have a linked list where each node contains a pointer to a string (which has been malloc'd when the node was created and inserted) and a pointer to the next node in the linked list.

I'm creating a function which will free the node (or effectively delete it). However, I'm receiving a free(): invalid pointer error.

My function:

void removeNode(node *(*nodeToRemove))
{
free((*nodeToRemove)->data);
(*nodeToRemove)->next = NULL;
free(*nodeToRemove);
}

Is this how I should go about freeing this node?

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