Week 5: Assignment - Linked Lists
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cmake_minimum_required(VERSION 3.16)
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project(week-05)
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set(CMAKE_CXX_STANDARD 17)
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add_executable(week-05 main.cpp)
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Champlain College SDEV-345-81
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*
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* C++ Week 5: Linked Lists (first semester) - linked list program (2020/09/20)
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*
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* Write a menu driven program that simulates a simple linked list. The program
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* should give the user the following options and should run in an infinite loop:
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* 1) Insert node
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* 2) Delete node
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* 3) Display list
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* 4) Find node
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*
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* Do not use the C++ Standard Template library.
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*
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* Written by Llewellyn van der Merwe <llewellyn.vandermerw@mymail.champlain.edu>, October 2020
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* Copyright (C) 2020. All Rights Reserved
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* License GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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// Adaptation to the code found at
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// Week 5: Lectures
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// Demonstrates sorted linked list
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#include <iostream>
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using namespace std;
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/////////////////////////////////////////////////////////////
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class Node {
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public:
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int iData; // data item
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double dData; // data item
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Node *pNext; // ptr to next link in list
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//----------------------------------------------------------
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Node(int id, double dd) : // constructor
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iData(id), dData(dd), pNext(NULL) {}
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//----------------------------------------------------------
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void displayNode() // display ourselves {22, 2.99}
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{
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cout << "{" << iData << ", " << dData << "} ";
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}
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//----------------------------------------------------------
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}; // end class Node
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/////////////////////////////////////////////////////////////
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class NodeList {
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private:
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Node *pFirst; // ptr to first link on list
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public:
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//----------------------------------------------------------
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NodeList() : pFirst(NULL) // constructor
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{} // no links on list yet
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//----------------------------------------------------------
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~NodeList(){ // destructor
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while(!isEmpty()){ // until it's empty,
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removeFirst(); // remove it
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}
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}
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//----------------------------------------------------------
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bool isEmpty() // true if list is empty
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{ return pFirst == NULL; }
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//----------------------------------------------------------
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// insert at start of list
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void insertFirst(int id, double dd) { // make new link
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Node *pNewNode = new Node(id, dd);
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pNewNode->pNext = pFirst; // newNode-->old first
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pFirst = pNewNode; // first-->newNode
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}
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//----------------------------------------------------------
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Node *getFirst() // return first link
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{ return pFirst; }
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//----------------------------------------------------------
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void insert(int key, double dd) // insert, in order
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{
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Node* pNewLink = new Node(key, dd); // make new link
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Node* pPrevious = NULL; // pointer to previous
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Node* pCurrent = pFirst; // start at first
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// Look for position prior to the end of the list
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while(pCurrent != NULL && key > pCurrent->iData) // We sort insert by key and not value
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{
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pPrevious = pCurrent; // adjust previous ptr
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pCurrent = pCurrent->pNext; // go to next item
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}
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// Insert link the link
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if(pPrevious==NULL) // at beginning of list
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pFirst = pNewLink; // first --> newLink
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else // not at beginning
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pPrevious->pNext = pNewLink; // old prev --> newLink
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pNewLink->pNext = pCurrent; // newLink --> old current
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} // end insert()
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//----------------------------------------------------------
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void removeFirst() // delete first link
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{ // (assumes list not empty)
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Node *pTemp = pFirst; // save first
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pFirst = pFirst->pNext; // unlink it: first-->old next
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delete pTemp; // delete old first
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}
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//-----------------------------------------------------------
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Node* find(int key) // find link with given key
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{ // (assumes non-empty list)
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Node* pCurrent = pFirst; // start at 'first'
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while(pCurrent->iData != key) // while no match,
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{
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if(pCurrent->pNext == NULL) // if end of list,
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return NULL; // didn't find it
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else // not end of list,
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pCurrent = pCurrent->pNext; // go to next link
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}
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return pCurrent; // found it
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}
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//-----------------------------------------------------------
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Node* find(double key) // find link with given key
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{ // (assumes non-empty list)
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Node* pCurrent = pFirst; // start at 'first'
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while(pCurrent->dData != key) // while no match,
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{
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if(pCurrent->pNext == NULL) // if end of list,
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return NULL; // didn't find it
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else // not end of list,
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pCurrent = pCurrent->pNext; // go to next link
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}
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return pCurrent; // found it
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}
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//-----------------------------------------------------------
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bool remove(int key) // remove link with given key
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{ // (assumes non-empty list)
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Node* pCurrent = pFirst; // search for link
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Node* pPrevious = pFirst;
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while(pCurrent->iData != key)
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{
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if(pCurrent->pNext == NULL)
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return false; // didn't find it
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else
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{
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pPrevious = pCurrent; // go to next link
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pCurrent = pCurrent->pNext;
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}
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} // found it
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if(pCurrent == pFirst) // if first link,
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pFirst = pFirst->pNext; // change first
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else // otherwise,
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pPrevious->pNext = pCurrent->pNext; // bypass it
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delete pCurrent; // delete link
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return true; // successful removal
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}
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//-----------------------------------------------------------
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bool remove(double value) // remove link with given key
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{ // (assumes non-empty list)
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Node* pCurrent = pFirst; // search for link
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Node* pPrevious = pFirst;
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while(pCurrent->dData != value)
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{
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if(pCurrent->pNext == NULL)
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return false; // didn't find it
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else
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{
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pPrevious = pCurrent; // go to next link
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pCurrent = pCurrent->pNext;
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}
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} // found it
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if(pCurrent == pFirst) { // if first link,
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if (pCurrent->pNext == NULL) {
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pFirst = pFirst->pNext; // change first
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} else {
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pFirst = NULL; // empty the list
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}
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} else { // otherwise,
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pPrevious->pNext = pCurrent->pNext; // bypass it
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}
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delete pCurrent; // delete link
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return true; // successful removal
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}
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//----------------------------------------------------------
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void displayList() {
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cout << "List (first-->last): ";
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Node *pCurrent = pFirst; // start at beginning of list
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while (pCurrent != NULL) // until end of list,
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{
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pCurrent->displayNode(); // print data
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pCurrent = pCurrent->pNext; // move to next link
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}
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cout << endl;
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}
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//----------------------------------------------------------
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}; // end class NodeList
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/////////////////////////////////////////////////////////////
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void getUserInput(int &action, const string& act){ // get the user input
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cin.clear();
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while (true) {
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cout << act << " a node by key or value." << endl;
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cout << "1] Key" << endl; // Select to find by key
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cout << "2] Value" << endl; // Select to find by value
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cout << "[1/2]: ";
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cin >> action;
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if (!cin.fail() && (action == 1 || action == 2)) {
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cin.ignore(numeric_limits<streamsize>::max(), '\n');
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break;
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}
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cin.clear();
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cin.ignore(numeric_limits<streamsize>::max(), '\n');
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cout << "Selection must be between 1 or 2, lets try again." << endl;
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}
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}
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void getUserInput(const string& question, int &key){
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cin.clear();
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while (true) {
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cout << question << endl;
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cout << "[integer]: "; // get only an integer
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cin >> key;
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if (!cin.fail() && key > 0) {
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cin.ignore(numeric_limits<streamsize>::max(), '\n');
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break;
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}
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cin.clear();
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cin.ignore(numeric_limits<streamsize>::max(), '\n');
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cout << "The key must be an integers above zero, lets try again." << endl;
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}
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}
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void getUserInput(const string& question, double &value){
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cin.clear();
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while (true) {
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cout << question << endl;
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cout << "[double]: ";
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cin >> value; // get only an double
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if (!cin.fail() && value > 0) {
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cin.ignore(numeric_limits<streamsize>::max(), '\n');
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break;
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}
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cin.clear();
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cin.ignore(numeric_limits<streamsize>::max(), '\n');
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cout << "The value must be an double above zero, lets try again." << endl;
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}
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}
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void displayMenu(int& action, NodeList& theList){
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while (true) {
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if (theList.isEmpty()) {
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cout << "Your link-list is empty, insert your first node." << endl;
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action = 1;
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break;
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}
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cin.clear();
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cout << "1] Insert Node" << endl; // Select to insert node
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cout << "2] Delete Node" << endl; // Select to delete node
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cout << "3] Display List" << endl; // Select to display list
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cout << "4] Find node" << endl; // Select to display list
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cout << "[1-4]: ";
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cin >> action;
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action = (int) action;
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if (!cin.fail() && action > 0 && action < 5) {
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break;
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}
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cin.clear();
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cin.ignore(numeric_limits<streamsize>::max(), '\n');
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cout << "Selection must be between 1 and 4, lets try again." << endl;
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}
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}
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/////////////////////////////////////////////////////////////
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int main() {
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NodeList theList; // make new list
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int action; // the driver action
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int idata; // the driver int Data
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double ddata; // the driver double Data
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cout << "Demonstrating the infinite link-list program" << endl; // little notice
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while (true) {
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displayMenu(action, theList); // display the menu
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if (action == 1){ // insert a node
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getUserInput("Enter a key", idata);
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getUserInput("Enter a value", ddata);
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theList.insert(idata, ddata);
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cout << "A node with this key(" << idata << ") and this value(" << ddata << ") was added." << endl;
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} else if (action == 2){ // delete node
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getUserInput(action, "Delete");
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if (action == 1) {
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getUserInput("Enter a key to delete", idata);
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if (theList.remove(idata)){
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cout << "The first node with this key(" << idata << ") was removed." << endl;
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} else {
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cout << "A node with this key(" << idata << ") was not found." << endl;
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}
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} else if (action == 2) {
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getUserInput("Enter a value to delete", ddata);
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if (theList.remove(ddata)){
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cout << "The first node with this value(" << ddata << ") was removed." << endl;
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} else {
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cout << "A node with this value(" << ddata << ") was not found." << endl;
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}
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}
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} else if (action == 3){ // display list
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theList.displayList();
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} else if (action == 4){ // find node
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getUserInput(action, "Find");
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if (action == 1) {
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getUserInput("Enter a key to find", idata);
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Node* found = theList.find(idata);
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if (found){
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cout << "The first node with this key(" << idata << ") was found. ";
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found->displayNode();
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cout << endl;
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} else {
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cout << "A node with this key(" << idata << ") was NOT found." << endl;
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}
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} else if (action == 2) {
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getUserInput("Enter a value to find", ddata);
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Node* found = theList.find(ddata);
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if (found){
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cout << "The first node with this value(" << ddata << ") was found. ";
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found->displayNode();
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cout << endl;
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} else {
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cout << "A node with this value(" << ddata << ") was NOT found." << endl;
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}
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}
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} else {
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break; // just to remove endless loop warning (should never happen)
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}
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}
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return 0;
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} // end main()
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