倒三角

for (int a = 1; a <= 8; a++)
            {
                for (int b = 1; b <= a - 1; b++)
                {
                    Console.Write("\0");
                }                               
                for (int b = a; b<= 8; b++)
               {
                    Console.Write("$");
                }                   
                   Console.Write("\n");
                }
                Console.ReadLine();