Christmas Tree Generator

Program.cs

namespace ChristmasTree;

static class Program
{
    static void Main(string[] args)
    {
        // Get the width of the tree from the first command line argument
        int width = int.Parse(args[0]);

        // Make sure the width is odd
        if (width % 2 == 0)
        {
            Console.WriteLine("Error: The width must be an odd number.");
            return;
        }

        // Calculate the number of rows needed for the top of the tree
        int numRows = (width + 1) / 2;

        // Create a random number generator
        var rand = new Random();

        // Draw the top of the tree
        for (int i = 0; i < numRows; i++)
        {
            // Calculate the number of asterisks for this row
            int numAsterisks = (i * 2) + 1;

            // Calculate the number of spaces on either side of the asterisks
            int numSpaces = (width - numAsterisks) / 2;

            // Choose a random number of ornaments for this row
            int numOrnaments = rand.Next(numAsterisks + 1);

            // Create a list of ornaments for this row
            var ornaments = Enumerable.Repeat('o', numOrnaments).Concat(Enumerable.Repeat('*', numAsterisks - numOrnaments)).ToList();

            // Shuffle the ornaments
            ornaments = ornaments.OrderBy(x => rand.Next()).ToList();

            // Draw the row
            Console.ForegroundColor = ConsoleColor.Green;
            Console.Write(new string(' ', numSpaces));
            for (int j = 0; j < ornaments.Count; j++)
            {
                if (ornaments[j] == 'o')
                {
                    // Choose a random color for the ornament
                    ConsoleColor color = (ConsoleColor)rand.Next(1, 16);
                    Console.ForegroundColor = color;
                }
                Console.Write(ornaments[j]);
                Console.ForegroundColor = ConsoleColor.Green;
            }
            Console.WriteLine(new string(' ', numSpaces));
        }

        // Draw the trunk of the tree
        Console.ForegroundColor = ConsoleColor.DarkRed;
        Console.WriteLine(new string(' ', width / 2) + "|" + new string(' ', width / 2));
        Console.WriteLine(new string(' ', width / 2) + "|" + new string(' ', width / 2));

        // Reset the console color
        Console.ResetColor();

        // Print a blank line
        Console.WriteLine();

        // Print the message
        string message = "Merry Christmas!";
        Console.ForegroundColor = ConsoleColor.White;
        Console.WriteLine(new string(' ', (width - message.Length) / 2) + message + new string(' ', (width - message.Length) / 2));
    }
}