PlotCircle

using System;
using System.Threading;

namespace PlotCircle
{
    class Program
    {
        static void Main(string[] args)
        {
            int radius = 50;
            for (int i=0; i<120; i++)
            {
                double theta =2*Math.PI*(i/120.0);     // 0.0 -> 2*Math.PI
                double cos = Math.Cos(theta);          // -1.0 -> +1.0
                double sin = Math.Sin(theta);          // -1.0 -> +1.0
                int x = (int)(radius * (1 + cos));     // 0 -> 100
                int y = (int)(radius/2.0 * (1 + sin)); // 0 -> 50 (divide by 2 because character box is not square
                PlotPoint(x, y, '*');
                Thread.Sleep(50);                      // delay 1/20 second to see the sequence in plotting output
            }
            Console.ReadKey(true);
        }

        protected static void PlotPoint(int x, int y, char c)
        {
            try
            {
                Console.SetCursorPosition(x, y);
                Console.Write(c);
            }
            catch (ArgumentOutOfRangeException e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }
}