mandelbrot图像实现不了菜鸟求指点

Question

哪个地方的问题，谢谢各位大大。
 static void Main(string[] args)
        {
            double realCoord, imagCoord;
            double realTemp, imagTemp, realTemp2, arg;
            int itaretions;
            for (imagCoord = 1.2; imagCoord >= -1.2; imagCoord -= 0.05)
            {
                for (realCoord = -0.6; realCoord <= 1.77; realCoord += 0.03)
                {
                    itaretions = 0;
                    realTemp = realCoord;
                    imagTemp = imagCoord;
                    arg = (realCoord * realCoord) + (imagCoord * imagCoord);
                    while ((arg <4)&&(itaretions <40))
                     {
                         realTemp2 = (realTemp * realTemp) - (imagTemp * imagTemp) - realCoord;
                         imagTemp = (2 * realTemp * imagTemp) - imagCoord;
                         realTemp = realTemp2;
                         arg = (realTemp * realTemp) + (imagTemp * imagTemp);
                         itaretions += 1;
                     }
                    switch (itaretions % 4)
                    {
                        case 0:
                            Console.Write (".");
                            break ;
                        case 1:
                            Console.Write ("O");
                            break ;
                        case 2:
                            Console.Write("O");
                            break; 
                        case 3:
                            Console.Write("@");
                            break;
                    }
                    Console.Write("\n");
                }
                Console.ReadKey();
            }

Answer 1

http://www.codeproject.com/KB/graphics/mandelbrot.aspx

Answer 2

case 1:
                            Console.Write ("O");
                            break ;
这句中“O”改为小写字母“o”。