9*9乘法表

                int i, j;
                for (i = 1; i < 10; i++)
                {
                    for (j = 1; j <= i; j++)
                    {
                        Console.Write("{0:D1}*{1:D1}={2,2}  ", i, j, i * j);
                    }
                    Console.WriteLine("");
                }
                Console.ReadLine();