hash function help!!!!

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  12 years ago

  by aax13110

  Annie Maki

  , United States

  Joined 13 years ago

  Can anyone help me to write up a hash function* that uses the 6 digit grid reference as a key. Using this function and the hill details already generated, add the hill details to another array, this time of 63 elements and this will be my hash table.
  please im stuck!!!

  this is my piece of code for the linklist.cpp

   

   

  #include "LinkedList.h"
  using namespace std;

   

  LinkedList::LinkedList(){ //constructor
      head = NULL;
      last = NULL;
      count = 0;
  }

  void LinkedList:: insertNodeAtStart(int height, int distanceFromHome, bool climbed, int gridReference){
   Node *nextNode;   
   nextNode = new Node;  
   nextNode->height = height; 
   nextNode->distanceFromHome= distanceFromHome;
   nextNode->climbed= climbed;
   nextNode->gridReference= gridReference;

   nextNode->link = head; 
       
   head = nextNode; 

   count++;   
   
  if(last == NULL){ 
    last = nextNode; 
   }    
  }

  void LinkedList:: insertNodeAtEnd(int height, int distanceFromHome, bool climbed, int gridReference ){
       Node *lastNode;
       lastNode= new Node;
      
       lastNode->link= NULL;
       lastNode->height = height; 
       lastNode->distanceFromHome= distanceFromHome;
    lastNode->climbed= climbed;
    lastNode->gridReference= gridReference;
      
       count++;
      
       if(head==NULL){
                      head= lastNode;                             //if this is the only node, make it first and last.
                      last= lastNode;
                      }
                      else{
                           last->link= lastNode;                 //make the link of the last node point to our new node
                           last= lastNode;                       //make last or newly created node.
                      }
       }
      
   

  int LinkedList::getNodeCount(){
      return count;
      }
     
  Node* LinkedList::getFirst(){
        return head;
        }
       

  void LinkedList::deleteFirstNode(){
  if(count > 0){
    Node *temp = head;
         
    head = head->link;  
        
    delete temp; 
    count--;
  }
   else{
    cout<<"There are no nodes to delete."<<endl;
   }
  }
   
  /*bool LinkedList::findNumber(int number){
      
       int noOfNodes=getNodeCount();
       Node *current;
       current= getFirst();
      
       for(int i=0; i<=noOfNodes-1; i++){
               if(number==current->data){
                                        cout<<"found"<<endl;
                                        return true;
                                        }
               else{
                    current=current->link;
                    }
      
               }
       cout<<"Number is not in the Linked List"<<endl;
       return false;
       }*/
      
  /*void LinkedList::deleteNode(int number){
      
       Node *current, *next;                                      //two pointer to help maipulate position
       current= head;                                             //set current to the head of the list
       if(current->data== number)                                 //if the number is first in the list
       {
                    head= current->link;                          //make head point to the one after
                    delete current;                               //delete the node which used to be head
                    count--;                                     //reduce count by one
                    return; 
       }
      
       next=current;                                               //make next = the new head node (current)
       while(next!=NULL)                                           //iterate through until no more nodes
       {
                  if(current->data==number)                        //if the data in current is the number
                  {
                                    next->link= current->link;     //make the link next points to = to what current is pointing to
                                    delete current;                 //delete the current node
                                    count--;
                                    return;
                  }
                 
                  next=current;                                    //keep iterating until the number is found
                  current=current->link;
       }
       cout<<"Element not Found!"<<endl;                            //if not in the list display suitable.
  }*/
                 

   

  void LinkedList:: deleteAllNodes(){
       int noOfNodes= getNodeCount();
       Node *current;
       current= head;
      
       for(int i=0; i<noOfNodes;i++){
                            current->link=current;
                            delete current;
                            count--;
                            }
      }

  void LinkedList::printNode(){
       int noOfNodes= getNodeCount();
       Node *current;
       current= head;
      
       for(int i=0; i<noOfNodes; i++){
               cout<<"Height: "<<current->height<<endl;
               cout<<"Distance from Home: "<<current->distanceFromHome<<endl;
               cout<<"Climbed: "<<current->climbed<<endl;
               cout<<"Grid Ref: "<<current->gridReference<<endl;
               cout<<"-------------------"<<endl;
               current= current->link;
               }
       }
      
  void LinkedList::insertNodet(int height, int distanceFromHome, bool climbed, int gridReference){
      
       Node* current= head;
       Node* previous= NULL;
       Node* temp= new Node();
       count++;
      
       temp->height= height;
       temp->distanceFromHome= distanceFromHome;
       temp->climbed= climbed;
       temp->gridReference= gridReference;
       temp->link= NULL;

       if(count==1)
       {         
                  head= temp;
                  last= temp;
                  return;
       }
       do{
                  if(current->height<temp->height)
                  {
                             temp->link= current;

                               if(current== head)
                                {
                                   head= temp;
                                   return;
                                }
                               else
                               {
                                 previous->link= temp;
                                 return;
                               }
                               if(current==last)
                               {
                                  current->link=temp;
                                  last= temp;
                                  return;
                               }
                  }
                  previous=current;
                  current= current->link;
                 
                  }         
       while(current!=NULL);
  }

  
  void LinkedList::swap(Node *current, Node *next){

       Node *swap;
       Node *swapLink;
      
       swapLink= current->link;
       current->link= next->link;
       next->link= swapLink;
      
       swap= current;
       current=next;
       next=swap;
  };

   

  void LinkedList::sort();
  {

  {
       int noOfNodes= getNodeCount();
       Node *current;
       Node *nextNode;
       current= head;
       nextNode= current->link;
      
       for(int i=0;i<noOfNodes;i++){
               if(current=NULL){
                                cout<<"No hills in list"<<endl;
                                return;
                                }
               if(current->height>nextNode->height){
                                                    swap(current, nextNode);
               }
       }

   

   

  
  /*void LinkedList::printNode()
  {
       int noOfNodes= getNodeCount();
       Node *current;
       current= head;
       cout << "Number of Nodes == " << noOfNodes << endl;
       for(int i=0; i<noOfNodes && current != NULL; i++)
       {
               cout<<"Height: "<<current->height<<endl;
               cout<<"Distance from Home: "<<current->distanceFromHome<<endl;
               cout<<"Climbed: "<<current->climbed<<endl;
               cout<<"Grid Ref: "<<current->gridReference<<endl;
               cout<<"-------------------"<<endl;
               current= current->link;
     
  }*/

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• • Reply

  12 years ago

  by Mohammad Rastkar

  Mohammad Rastkar

  Shiraz, Iran

  Joined 14 years ago

  You can also use STL;  <hash_map> or <hash_set> or even <map>. See MSDN for infos.

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