CircleNumbers

using System;



class CircleNumbers
{
    static void Main()
    {
        start:
        Console.Write("n = ");
        int n = int.Parse(Console.ReadLine());
        if (n <= 0 || n > 20)
        {
            Console.WriteLine("Error! N must be in range 1-20");
            goto start;
        }
        Console.Clear();
        int MinCol=0;
        int MaxCol=(n*4)-4;
        int MinRow=0;
        int MaxRow = n-1;
        int row = 0;
        int col = 0;
        for (int i = 1; i <= n * n; )
        {
            if (row == MinRow && col <= MaxCol)
            {
                for (col = MinCol; col <= MaxCol; col = col +4)
                {
                    Console.SetCursorPosition(col, row);
                    Console.Write(i);
                    i++;
                }
                MinRow++;
                col = MaxCol;
            }
            if (col == MaxCol && row < MaxRow)
            {
                for (row = MinRow; row <= MaxRow; row++)
                {
                    Console.SetCursorPosition(col, row);
                    Console.Write(i);
                    i++;
                }
                MaxCol = MaxCol - 4;
                row = MaxRow;
            }
            if (row == MaxRow && col > MaxCol)
            {
                for (col = MaxCol; col >= MinCol; col = col - 4)
                {
                    Console.SetCursorPosition(col, row);
                    Console.Write(i);
                    i++;
                }
                MaxRow--;
                col = MinCol;
            }
            if (col == MinCol && row > MaxRow)
            {
                for (row = MaxRow; row >= MinRow; row--)
                {
                    Console.SetCursorPosition(col, row);
                    Console.Write(i);
                    i++;
                }
                MinCol = MinCol + 4;
                row = MinRow;
            }
        }
        Console.SetCursorPosition(1, (n * 2) + 2);
    }
}