用*输出正方形对角线

 for (int hang = 0; hang < 11; hang++)
            {
                for (int lie = 0; lie < 11; lie++)
                {
                    if (hang == lie)
                        Console.Write("*");
                    else if (hang + lie == 10)
                        Console.Write("*");
                    else
                        Console.Write(" ");
                    if (lie == 10)
                        Console.WriteLine();
                }
            }
            Console.ReadKey();