Answered: C++ I need to write a recursive…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

In C++ I need to write a recursive function insertEnd that will call a recursive method insertEnd(const ItemType& newEntry, Node<ItemType>* node), to insert newEntry at the end of the linked list

I completely stuck and can't figure out where the error is coming from.

main

#include <iostream>

#include "LinkedList.cpp"

int main() {

Node<int>* first = new Node(1);

Node<int>* second = new Node(2);

Node<int>* third = new Node(3);

first->next = second;

second->next = third;

cout<<first->data<<endl;

cout<<first->next->data<<endl;

cout<<first->next->next->data<<endl;

LinkedList<int> list; //an empty linked list

for(int i =0; i<10; i++){

list.inserEnd(i);

list.display();

}

return 0;

}

linkedlist.cpp

#include "LinkedList.h"

#include "iostream"

using namespace std;

template <class T>

LinkedList<T>::LinkedList(){

head = nullptr;

}

template <class T>

void LinkedList<T>::insertEnd(const T& newEntry) {

Node<T>* newNode = new Node(newEntry);

if(head == nullptr) {

return newNode(newEntry);

}else

head->next = insertEnd(head->next, newEntry);

return head;

}

template <class T>

void LinkedList<T>::display(){

Node<T>* temp = head;

while(temp!=nullptr){

cout<<temp->data<<"->"; //display the data of node that temp points to

temp = temp->next; // advance the temp pointer to next node

}

cout<<endl;

}

LinkedList.h

#ifndef LIST_H

#define LIST_H

#include "node.h"

template <class T>

class LinkedList {

private:

Node<T>* head;

// int newEntry;

public:

LinkedList();

void insertEnd(const T& newEntry);

void display();

};

#endif

Node.h

#ifndef NODE_H

#define NODE_H

template <class T>

class Node{

public:

T data;

Node<T>* next;

Node(T d){

data = d;

next = nullptr;

}

};

#endif

> clang++-7 -pthread -std=C++17 -o main LinkedList.cpp main.cpp
In file included from main.cpp:2:
./LinkedList.cpp:17:11: error: called object type 'Node<int> *' is not a
function or function pointer
return newNode(newEntry);
main.cpp:22:8: note: in instantiation of member function
'LinkedList<int>::insertEnd' requested here
list.insertEnd(i);
In file included from main.cpp:2:
./LinkedList.cpp:20:3: error: void function 'insertEnd' should not return a
value [-Wreturn-type]
return head;
2 errors generated.
compiler exit status 1

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