using System; namespace RoomManagement { ///

/// Represents a work room with a name and capacity. ///

public class WorkRoom { public string Name { get; set; } public int Capacity { get; set; } ///

/// Initializes a new instance of the class. ///

/// The name of the work room. /// The capacity of the work room. public WorkRoom(string name, int capacity) { if (string.IsNullOrWhiteSpace(name)) { throw new ArgumentException("Room name cannot be empty or whitespace.", nameof(name)); } if (capacity < 0) { throw new ArgumentOutOfRangeException(nameof(capacity), "Capacity cannot be negative."); } Name = name; Capacity = capacity; } public override string ToString() { return $"Room '{Name}' (Capacity: {Capacity})"; } } } using System; using System.Collections.Generic; using System.Linq; // Required for LINQ Count method namespace RoomManagement { public static class RoomCounter { ///

/// Counts the number of work rooms in a collection that have a specific capacity. ///

/// The collection of work rooms. /// The capacity to count. /// The number of rooms with the specified capacity. public static int CountRoomsWithCapacity(IEnumerable rooms, int targetCapacity) { if (rooms == null) { throw new ArgumentNullException(nameof(rooms), "Room collection cannot be null."); } if (targetCapacity < 0) { throw new ArgumentOutOfRangeException(nameof(targetCapacity), "Target capacity cannot be negative."); } // Use LINQ to count rooms matching the criteria return rooms.Count(room => room.Capacity == targetCapacity); // Alternative implementation using a loop: // int count = 0; // foreach (var room in rooms) // { // if (room.Capacity == targetCapacity) // { // count++; // } // } // return count; } } } using System; using System.Collections.Generic; using RoomManagement; // Use the namespace containing WorkRoom and RoomCounter namespace RoomCapacityApp { class Program { static void Main(string[] args) { // Create 3 WorkRoom objects var room1 = new WorkRoom("Conference Room A", 15); var room2 = new WorkRoom("Training Room 1", 20); var room3 = new WorkRoom("Focus Booth Alpha", 20); var room4 = new WorkRoom("Large Hall", 50); // Added another room for variety // Store the rooms in a list var workRooms = new List { room1, room2, room3, room4 }; Console.WriteLine("Created Work Rooms:"); foreach (var room in workRooms) { Console.WriteLine($"- {room}"); } Console.WriteLine(); // Add a blank line for readability // Define the target capacity int targetCapacity = 20; // Count how many rooms have the target capacity int count = RoomCounter.CountRoomsWithCapacity(workRooms, targetCapacity); // Display the result Console.WriteLine($"Number of rooms with a capacity of {targetCapacity} people: {count}"); // Example of handling potential exceptions (though unlikely with this setup) try { // Example: Counting rooms with negative capacity (will throw exception) // int invalidCount = RoomCounter.CountRoomsWithCapacity(workRooms, -5); // Console.WriteLine($"Number of rooms with capacity -5: {invalidCount}"); // This line won't be reached } catch (ArgumentOutOfRangeException ex) { Console.WriteLine($"\nError counting rooms: {ex.Message}"); } catch (Exception ex) // Catch other potential errors { Console.WriteLine($"\nAn unexpected error occurred: {ex.Message}"); } } } }