help regarding linked list

[sahithi.visvanathan]

include a member function named rangeSearch. The function should search the list for a specified range values, defined by two numbers. All value found to be within the range shall be returned a pointer to a list of Nodes in search range. If no value is found, the function should return a Null pointer.

// A class template for holding a linked list.
#ifndef LINKEDLIST_H
#define LINKEDLIST_H
#include <iostream>     // For cout and NULL
using namespace std;

template <class T>
class LinkedList
{
private:
   // Declare a structure for the list
   struct ListNode
   {
      T value;
      struct ListNode *next;
   }; 

   ListNode *head;   // List head pointer

public:
   LinkedList()   // Constructor
      { head = NULL; }
   ~LinkedList(); // Destructor
   void appendNode(T);
   void insertNode(T);
   void deleteNode(T);
   void displayList();
   int rangesearch(T);    // search function
};




template <class T>
void LinkedList<T>::appendNode(T newValue)
{
   ListNode *newNode, *nodePtr;

   // Allocate a new node & store newValue
   newNode = new ListNode;
   newNode->value = newValue;
   newNode->next = NULL;

   // If there are no nodes in the list
   // make newNode the first node
   if (!head)
      head = newNode;
   else  // Otherwise, insert newNode at end
   {
      // Initialize nodePtr to head of list
      nodePtr = head;

      // Find the last node in the list
      while (nodePtr->next)
         nodePtr = nodePtr->next;

      // Insert newNode as the last node
      nodePtr->next = newNode;
   }
}



template <class T>
void LinkedList<T>::displayList()
{
   ListNode *nodePtr;

   nodePtr = head;
   while (nodePtr)
   {
      cout << nodePtr->value << endl;
      nodePtr = nodePtr->next;
   }
}



template <class T>
void LinkedList<T>::insertNode(T newValue)
{
   ListNode *newNode, *nodePtr, *previousNode = NULL;

   // Allocate a new node & store newValue
   newNode = new ListNode;
   newNode->value = newValue;

   // If there are no nodes in the list
   // make newNode the first node
   if (!head)
   {
      head = newNode;
      newNode->next = NULL;
   }
   else  // Otherwise, insert newNode
   {
      // Initialize nodePtr to head of list and
      // previousNode to NULL.
      nodePtr = head;
      previousNode = NULL;

      // Skip all nodes whose value member is less
      // than newValue.
      while (nodePtr != NULL && nodePtr->value < newValue)
      {  
         previousNode = nodePtr;
         nodePtr = nodePtr->next;
      }

      // If the new node is to be the 1st in the list,
      // insert it before all other nodes.
      if (previousNode == NULL)
      {
         head = newNode;
         newNode->next = nodePtr;
      }
      else  // Otherwise, insert it after the prev. node.
      {
         previousNode->next = newNode;
         newNode->next = nodePtr;
      }
   }
}


template <class T>
void LinkedList<T>::deleteNode(T searchValue)
{
   ListNode *nodePtr, *previousNode;

   // If the list is empty, do nothing.
   if (!head)
      return;

   // Determine if the first node is the one.
   if (head->value == searchValue)
   {
      nodePtr = head->next;
      delete head;
      head = nodePtr;
   }
   else
   {
      // Initialize nodePtr to head of list
      nodePtr = head;

      // Skip all nodes whose value member is 
      // not equal to searchValue.
      while (nodePtr != NULL && nodePtr->value != searchValue)
      {  
         previousNode = nodePtr;
         nodePtr = nodePtr->next;
      }

      // If nodePtr is not at the end of the list, 
      // link the previous node to the node after
      // nodePtr, then delete nodePtr.
      if (nodePtr)
      {
         previousNode->next = nodePtr->next;
         delete nodePtr;
      }
   }
}



template <class T>
LinkedList<T>::~LinkedList()
{
   ListNode *nodePtr, *nextNode;

   nodePtr = head;
   while (nodePtr != NULL)
   {
      nextNode = nodePtr->next;
      delete nodePtr;
      nodePtr = nextNode;
   }
}


template <class T>
int LinkedList<T>::rangesearch(T val)
{
   int count = 1;
   ListNode *nodePtr;

   nodePtr = head;
   while (nodePtr)
   {
      if( nodePtr->value == val)
      {
         return count;
      }
      else
      {

         nodePtr = nodePtr->next;
         count++;
      }
   }
   return 0;
}

this is the code i have got..how do i modify the range search code...i have no cluse what the question is aking for ..can any one help me

[Unimportant]

It helps to boil down linked list to its simplest form,
without answering your homework, here is my example of simplified form

struct Node
{
    int value;
    Node * next;

    Node() : next(NULL), value(0) {  }
    Node(int v) : next(NULL), value(v) {  }
    ~Node() { delete next; }

    // add a value to the end of the list
    void push( int v )
    {
      if( next ) next->push(v);
      else next = new Node(v);
    }

    Node * search( int v )
    { // Create a new list of objects matching v
      Node * return(NULL);
      // this basically means search the value
          // if( v == value ) ... This is different for complex types, though the principle remains

      // if it matches this exact node, instantiate the return node (construct with v)

              // Don't forget that return can (and will often be) NULL
      // if(next&&return) return->next = next->search( v ); ... Recursive search
      // else if(next) return = next->search( v );

      // Don't forget to delete the object this function returns
      // delete on NULL does nothing.
    }
};