Phonebook Application in C++

The code is for a basic phonebook application. 

1. *Includes*:
- ``: For input/output functionalities.
- ``: Allows use of the `std::vector` dynamic array.
- ``: For string operations and management.

2. *Struct `Contact`*:
- Defines a contact with two members: `name` and `phoneNumber`, both of type `std::string`.

3. *Class `Phonebook`*:
- *Private Member*:
- `contacts`: A vector that stores all the contacts.

- *Public Methods*:
- `addContact()`: Adds a contact to the `contacts` vector.
- `displayContacts()`: Iterates over the `contacts` vector and displays each contact's name and phone number.
- `removeContact()`: Searches for a contact by name and if found, removes it. Returns `true` if successful, otherwise `false`.
- `searchContact()`: Searches for a contact by name. If found, returns a pointer to the contact; otherwise returns `nullptr`.

4. *Main Function (main())*:

The main() function serves as the driver function. It provides a user interface where users can choose different operations like adding, displaying, searching, and removing contacts from the phonebook. The operations loop until the user chooses to exit.

- *Initialization*:
- `Phonebook phonebook`: An instance of the `Phonebook` class.
- `int choice`: To store the user's menu choice.

- *Menu Loop*:
- A loop that displays a menu to the user until they choose to exit (option 5).
- Options include adding, displaying, searching for, and removing a contact.
- Each option has its case within the `switch` statement:
1. *Add Contact*: Takes the user's input for name and phone number and adds the contact.
2. *Display All Contacts*: Uses the `displayContacts()` method to display all the contacts.
3. *Search Contact*: Prompts the user to enter a name, then searches for that contact and displays it if found.
4. *Remove Contact*: Prompts the user to enter a name, then attempts to remove that contact. Indicates success or failure based on the return value.
5. *Exit*: Exits the loop and subsequently the program.
- Any other input gives an "Invalid choice" message.

5. *Buffer Clearing*:
- After reading an integer choice with `std::cin`, there's a need to clear the input buffer using `std::cin.ignore()` before reading strings. This prevents `getline` from immediately reading the leftover newline character.

6. *Looping Condition*:
- The `do-while` loop will continue to display the menu and execute the user's choices until the user selects the "Exit" option (5).

The program ends by returning `0`, indicating successful execution.

In summary, the code describes a simple phonebook application that allows users to perform basic operations on contacts like adding, displaying, searching by name, and removing by name.