ArrayList of Points C# Exercise - C# Programming Course

// Import necessary namespaces for using ArrayList and other basic operations
using System;  // Basic namespace for console input/output and fundamental operations
using System.Collections;  // For using ArrayList

// Define the structure for representing a point in 3D space
struct Point3D
{
    // Properties to store the X, Y, and Z coordinates of the point
    public double X;  // X-coordinate
    public double Y;  // Y-coordinate
    public double Z;  // Z-coordinate

    // Constructor to initialize the coordinates of the point
    public Point3D(double x, double y, double z)
    {
        X = x;  // Set X-coordinate
        Y = y;  // Set Y-coordinate
        Z = z;  // Set Z-coordinate
    }

    // Method to display the point in a readable format
    public void DisplayPoint()
    {
        // Display the point's coordinates as (X, Y, Z)
        Console.WriteLine($"Point: ({X}, {Y}, {Z})");
    }
}

class Program
{
    // Main method to execute the program
    static void Main(string[] args)
    {
        // Create an ArrayList to store points
        ArrayList points = new ArrayList();  // ArrayList to hold Point3D objects
        string choice;  // Variable to store user's menu choice

        // Display the program menu
        do
        {
            // Display menu options to the user
            Console.Clear();  // Clear the console for a fresh display
            Console.WriteLine("3D Point Manager");
            Console.WriteLine("1. Add a point");
            Console.WriteLine("2. Display all points");
            Console.WriteLine("3. Exit");
            Console.Write("Enter your choice: ");
            choice = Console.ReadLine();  // Get the user's menu choice

            // Perform actions based on the user's choice
            switch (choice)
            {
                case "1":
                    // Add a new point
                    Console.Write("Enter X coordinate: ");
                    double x = Convert.ToDouble(Console.ReadLine());  // Read X-coordinate
                    Console.Write("Enter Y coordinate: ");
                    double y = Convert.ToDouble(Console.ReadLine());  // Read Y-coordinate
                    Console.Write("Enter Z coordinate: ");
                    double z = Convert.ToDouble(Console.ReadLine());  // Read Z-coordinate

                    // Create a new Point3D object with the provided coordinates
                    Point3D newPoint = new Point3D(x, y, z);

                    // Add the point to the ArrayList
                    points.Add(newPoint);  // Store the new point in the ArrayList
                    Console.WriteLine("Point added successfully.");
                    break;

                case "2":
                    // Display all entered points
                    Console.WriteLine("Displaying all points:");
                    foreach (Point3D point in points)  // Iterate through each point in the ArrayList
                    {
                        point.DisplayPoint();  // Call DisplayPoint method to show the point
                    }
                    break;

                case "3":
                    // Exit the program
                    Console.WriteLine("Exiting the program...");
                    break;

                default:
                    // Handle invalid input
                    Console.WriteLine("Invalid choice, please try again.");
                    break;
            }

            // Wait for the user to press a key before showing the menu again
            if (choice != "3")
            {
                Console.WriteLine("\nPress any key to continue...");
                Console.ReadKey();
            }

        } while (choice != "3");  // Repeat the menu until the user chooses to exit
    }
}