A simple console-based Contact Manager program written in the D programming language. This program allows users to manage a list of contacts, including adding, viewing, and saving contacts to a file.

Features

1. Add Contacts

   • Add a new contact by providing a name and phone number.

2. Display Contacts

   • View all the saved contacts in the contact list.

3. Save Contacts to File

   • Save the contact list to a text file contacts.txt for future reference.

Getting Started

Prerequisites

• D Programming Language Compiler (eg. DMD)

  Install DMD from dlang.org

Compilation

To compile the program, use the following command in the terminal:

dmd ContactManager.d

Running the Program

Run the compiled executable:

./ContactManager

Usage

1. Run the program.
2. Choose an option from the menu:
   • 1: Add a new contact.
   • 2: Display all contacts.
   • 3: Save contacts to a file.
   • 4: Exit the program.
3. Follow the prompts for each option.

Example Interaction

--- Contact Manager ---
1. Add Contact
2. Display Contacts
3. Save to File
4. Exit
Enter your choice: 1

Enter Name: 
John Doe
Enter Phone Number:
1234567890
Contact added: John Doe, 1234567890

--- Contact Manager ---
1. Add Contact
2. Display Contacts
3. Save to File
4. Exit
Enter your choice: 2

Contact List:
John Doe, 1234567890

File Output

Contacts are saved to a text file name contacts.txt. Each contact is stored on a new line in the format:

Name, Phone

Modules Used

• std.stdio:For input.output operations.
• std.file: For file handling.
• std.string: For string manipulation (e.g., stripping input).
• std.algorithm: For functional programming utilities.