Question

Using classes, design an online address book to keep track of the names, addresses, phone numbers, and dates of birth of family members, close friends, and certain business associates. Your program should be able to handle a maximum of 500 entries. Using linked lists, write the program to handle as many entries as required. Add the following operations to your program:

a. Add or delete a new entry to the address book.
b. When the program terminates, write the data in the address book to a disk

Answer 1

An online address book can be designed using classes and linked lists to manage a dynamic set of entries. The AddressBookEntry class will contain necessary contact details, and the linked list will facilitate adding or deleting entries. Data would be written to disk upon program termination using file handling methods.

Step-by-step explanation:

Designing an Online Address Book with Classes and Linked Lists

To design an online address book that can handle up to 500 entries using classes and linked lists, first, we need to define a class to represent each entry in the address book. The class can be named AddressBookEntry and should contain fields for name, address, phone number, and date of birth. Each instance of this class will represent a single contact in the address book.

Next, we implement a linked list to manage the collection of entries. This allows the program to handle as many entries as required, not just the initial maximum of 500 entries. The linked list will have functions to add or delete entries.

Finally, to write the data to a disk when the program terminates, we need to implement a method in our main class that iterates through the linked list, collects each entry's data, and writes it to a file on disk. You can use file handling APIs provided by the language of your choice to achieve this operation.