Binary C# Exercise - C# Programming Course

using System;  // Import the System namespace for basic functionality

class Program  // Define the main class
{
    static void Main()  // The entry point of the program
    {
        // Infinite loop to keep asking the user for input until they enter "end"
        while (true)
        {
            // Ask the user for a number or the word "end" to quit
            Console.Write("Enter a decimal number (or 'end' to quit): ");
            string input = Console.ReadLine();  // Read the input as a string

            // If the user enters "end", exit the loop and end the program
            if (input.ToLower() == "end")
            {
                Console.WriteLine("Goodbye!");
                break;  // Exit the loop
            }

            // Try to parse the input as an integer
            if (int.TryParse(input, out int number))
            {
                // Start with an empty string for the binary representation
                string binary = "";

                // Perform successive divisions by 2 to get the binary digits
                while (number > 0)
                {
                    // Get the remainder when dividing by 2 (this will be either 0 or 1)
                    int remainder = number % 2;
                    binary = remainder + binary;  // Add the remainder to the binary string
                    number = number / 2;  // Divide the number by 2
                }

                // If the number is 0, the binary representation should be "0"
                if (string.IsNullOrEmpty(binary))
                {
                    binary = "0";
                }

                // Display the binary result
                Console.WriteLine($"Binary: {binary}\n");
            }
            else
            {
                Console.WriteLine("Please enter a valid number.\n");
            }
        }
    }
}