using System;

​

class Program

{

    static void Main(string[] args)

    {

        Console.Write("Enter diameter of circle: ");

        int diameter = int.Parse(Console.ReadLine());

​

        char symbol = '*';

​

        int radius = diameter / 2;

        int centerX = Console.WindowWidth / 2;

        int centerY = Console.WindowHeight / 2;

​

        Console.CursorVisible = false;

​

        DrawCircle(diameter, radius, centerX, centerY);

​

        for (int i = 0; i < 360; i++)

        {

            double radians = i * Math.PI / 180.0;

            int x = (int)(centerX + radius * Math.Cos(radians));

            int y = (int)(centerY + radius * Math.Sin(radians));

​

            DrawSymbol(x, y, symbol);

​

            System.Threading.Thread.Sleep(25);

        }

​

        Console.CursorVisible = true;

        Console.ReadKey();

    }

​

    static void DrawCircle(int diameter, int radius, int centerX, int centerY)

    {

        for (int y = 0; y < diameter; y++)

        {

            for (int x = 0; x < diameter; x++)

            {

                double distance = Math.Sqrt(Math.Pow(x - radius, 2) + Math.Pow(y - radius, 2));

                if (distance > radius - 0.5 && distance < radius + 0.5)

                {

                    Console.SetCursorPosition(centerX - radius + x, centerY - radius + y);

                    Console.Write("*");

                }

            }

        }

    }

​

    static void DrawSymbol(int x, int y, char symbol)

    {

        Console.SetCursorPosition(x, y);

        Console.Write(symbol);

    }

}

​

​

​