C# Exercise: 67 Perimeter Area

using System;  // Import the System namespace to use basic classes like Console and Math

class Program  // Define the main class of the program
{
    static void Main()  // The entry point of the program
    {
        // Infinite loop to keep asking the user for input until they enter 0 for the width
        while (true)  
        {
            // Ask the user for the width of the rectangle
            Console.Write("Enter the width of the rectangle (0 to quit): ");
            double width = double.Parse(Console.ReadLine());  // Read the user's input and convert it to a double

            // If the width is 0, exit the loop and end the program
            if (width == 0)
            {
                Console.WriteLine("Goodbye!");
                break;  // Exit the while loop and end the program
            }

            // Ask the user for the height of the rectangle
            Console.Write("Enter the height of the rectangle: ");
            double height = double.Parse(Console.ReadLine());  // Read the user's input and convert it to a double

            // Calculate the perimeter of the rectangle (sum of all sides)
            double perimeter = 2 * (width + height);  
            
            // Calculate the area of the rectangle (base x height)
            double area = width * height;  

            // Calculate the diagonal using the Pythagorean theorem (sqrt(width^2 + height^2))
            double diagonal = Math.Sqrt(Math.Pow(width, 2) + Math.Pow(height, 2));  

            // Display the results
            Console.WriteLine($"Perimeter: {perimeter}");
            Console.WriteLine($"Area: {area}");
            Console.WriteLine($"Diagonal: {diagonal}\n");
        }
    }
}