利用goto，印出倒三角形

                int triangle1 = 0;
                int triangle2 = 9;
                for1:
                triangle2 = 9;
                for2:
                triangle2 -= 1;
                Console.Write(0);
                if (triangle2 > triangle1)
                    goto for2;
                triangle1 += 1;
                Console.WriteLine();
                if (triangle1 < 9)
                    goto for1;