Thread: Linked List help

So I created this code and I am trying to figure out why my insertback function won't insert a node in the back, instead it just repeats the first node.

Code:

#include "StringList.h"#include<iostream>


using std::cout;
using std::endl;




StringList::~StringList()
{
    ListNode *nodePtr;
    ListNode *nextNode;
    nodePtr = head;
    while (nodePtr != nullptr)
    {
        nextNode = nodePtr->next;
        delete nodePtr;
        nodePtr = nextNode;
    }
}


void StringList::insertFront(std::string word)
{
    ListNode *temp = new ListNode;
    temp->value = word;
    temp->next = head;
    head = temp;
}


void StringList::insertBack(std::string r)
{
    ListNode *temp = new ListNode;
    temp->value = r;
    temp->next = NULL;
    if (head == NULL)
    {
        head = temp;
    }
    else
    {
        ListNode *temp = head;
        while (temp->next != NULL)
        {
            temp = temp->next;
        }
    }
}


void StringList::deleteFront()
{
    ListNode *temp = head;
    head = head->next;
    delete(temp);
}


void StringList::deleteBack()
{
    ListNode *temp, *prev;
    prev = nullptr;
    if (head->next == NULL)
    {
        temp = head;
        head = NULL;
        delete(temp);
    }
    else {
        temp = head;
        while (temp->next != NULL)
        {
            prev = temp;
            temp = temp-> next;
        }
        prev->next = NULL;
        delete(temp);
    }
}


void StringList::displayList() const
{
    ListNode *nodePtr = head;
    
    while (nodePtr)
    {
        cout << nodePtr->value << endl;
        nodePtr = nodePtr->next;
    }
}