Answered: what is going on specifically in the…

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

I would like to know what is going on specifically in the void push class. I know there's a description, but I'm confused about how the code inside the class works. Thank you.

The code:

#include <iostream>

using namespace std;

// A linked list node

class Node

{

public:

int data;

Node *next;

};

// Given a reference (pointer to pointer) to

// the head of a list and an int inserts a

// new node on the front of the list.

void push(Node** head_ref, int new_data)

{

Node* new_node = new Node();

new_node->data = new_data;

new_node->next = (*head_ref);

(*head_ref) = new_node;

}

// Given a reference (pointer to pointer) to

// the head of a list and a position, deletes

// the node at the given position

void deleteNode(Node **head_ref, int position)

{

// If linked list is empty

if (*head_ref == NULL)

return;

// Store head node

Node* temp = *head_ref;

// If head needs to be removed

if (position == 0)

{

// Change head

*head_ref = temp->next;

// Free old head

free(temp);

return;

}

// Find previous node of the node to be deleted

for(int i = 0; temp != NULL && i < position - 1; i++)

temp = temp->next;

// If position is more than number of nodes

if (temp == NULL || temp->next == NULL)

return;

// Node temp->next is the node to be deleted

// Store pointer to the next of node to be deleted

Node *next = temp->next->next;

// Unlink the node from linked list

free(temp->next); // Free memory

// Unlink the deleted node from list

temp->next = next;

}

// This function prints contents of linked

// list starting from the given node

void printList( Node *node)

{

while (node != NULL)

{

cout << node->data << " ";

node = node->next;

}

// Driver code

int main()

{

// Start with the empty list

Node* head = NULL;

push(&head, 7);

push(&head, 1);

push(&head, 3);

push(&head, 2);

push(&head, 8);

cout << "Created Linked List: ";

printList(head);

deleteNode(&head, 4);

cout << "\nLinked List after Deletion at position 4: ";

printList(head);

return 0;

}

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