Objective

The objective of this program is to provide a basic structure for managing contacts. By using Go, we can efficiently add, store, and search contacts in a text-based interface. This simple contact book will allow you to enter new contacts, display existing ones, and search for a contact based on their name.

Program Code

        package main

        import (
            "fmt"
            "strings"
        )

        // Contact structure to store information about a contact
        type Contact struct {
            Name  string
            Phone string
            Email string
        }

        // ContactBook is a slice to store multiple contacts
        type ContactBook struct {
            contacts []Contact
        }

        // AddContact adds a new contact to the ContactBook
        func (cb *ContactBook) AddContact(name, phone, email string) {
            contact := Contact{
                Name:  name,
                Phone: phone,
                Email: email,
            }
            cb.contacts = append(cb.contacts, contact)
        }

        // ListContacts displays all the contacts in the ContactBook
        func (cb *ContactBook) ListContacts() {
            if len(cb.contacts) == 0 {
                fmt.Println("No contacts available.")
                return
            }
            for i, contact := range cb.contacts {
                fmt.Printf("Contact %d: %s, Phone: %s, Email: %s\n", i+1, contact.Name, contact.Phone, contact.Email)
            }
        }

        // SearchContact searches for a contact by name and displays it
        func (cb *ContactBook) SearchContact(name string) {
            found := false
            for _, contact := range cb.contacts {
                if strings.ToLower(contact.Name) == strings.ToLower(name) {
                    fmt.Printf("Found contact: Name: %s, Phone: %s, Email: %s\n", contact.Name, contact.Phone, contact.Email)
                    found = true
                    break
                }
            }
            if !found {
                fmt.Println("Contact not found.")
            }
        }

        func main() {
            var contactBook ContactBook

            // Adding sample contacts
            contactBook.AddContact("Alice Smith", "123-456-7890", "alice.smith@example.com")
            contactBook.AddContact("Bob Johnson", "987-654-3210", "bob.johnson@example.com")

            // Listing all contacts
            fmt.Println("List of all contacts:")
            contactBook.ListContacts()

            // Searching for a contact by name
            fmt.Println("\nSearch for contact 'Alice Smith':")
            contactBook.SearchContact("Alice Smith")
        }
        

Program Structure and Explanation

This Go program implements a simple Contact Book that allows you to:

• Add contacts with a name, phone number, and email.
• List all the contacts currently stored in the contact book.
• Search for a contact by name.

Program Breakdown:

• Contact struct: Defines the structure for storing each contact’s name, phone, and email.
• ContactBook struct: Holds a slice of contacts and has methods to manipulate them.
• AddContact: Adds a new contact to the contact book.
• ListContacts: Displays all contacts stored in the contact book.
• SearchContact: Searches for a contact by their name.
• main function: Acts as the entry point of the program where contacts are added, listed, and searched.

How to Run the Program:

To run this program, follow these steps:

1. Ensure you have Go installed on your machine. If not, download it from https://golang.org/dl/.
2. Create a new directory and save the program code in a file with a .go extension (e.g., contactbook.go).
3. Open your terminal and navigate to the directory where the file is saved.
4. Run the program using the following command: go run contactbook.go.
5. The program will display a list of all contacts and search for the contact ‘Alice Smith’.