using System;

public class Program

{

        public static double GetDistance(float p1X, float p1Z, float p2X, float p2Z)

        {

            double xDelta = p1X - p2X;

            double yDelta = p1Z - p2Z;

​

            return Math.Sqrt(Math.Pow(xDelta, 2) + Math.Pow(yDelta, 2));

        }

    public static void Main()

    {

        int window = 23;

        float radius = window / 2.0f;

        float cX = window / 2.0f;

        float cZ = cX;

        int numCells = 0;

        int numStreamedCells = 0;

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

        {

            for(int z = 0; z < window; ++z)

            {

                numCells++;

                if (GetDistance((float)cX, (float)cZ, (float)x + 0.5f, (float)z + 0.5f) < radius)

                {

                    numStreamedCells++;

                    Console.Write("+ " );

                }

                else

                {

                    Console.Write("- ");

                }

            }

            Console.WriteLine("");          

        }

        Console.WriteLine("");

        float percent = (float)numStreamedCells / (float)numCells;

        Console.WriteLine("Num Cells = "  + numCells.ToString());

        Console.WriteLine("Num Visible = " +   numStreamedCells.ToString());

        Console.WriteLine("Percent = " +  percent.ToString());

    }

}