Console.WriteLine("請輸入要打印的行數：");
            int n = Convert.ToInt32(Console.ReadLine());
            Console.Clear(); //清除以上顯示的內容
            string row = "";
            //這層循環控制打印的行數
            for (int i = 1; i <= n; i++)
            {
                //這層循環控制每行前面打印*的個數
                for (int j = 1; j <= 2 * i - 1; j++)
                {
                    // Console.Write("*");
                    row += "*";
                }
                //每打印完一行換一下行
                //設置打印出來的*居中顯示
                Console.SetCursorPosition((Console.WindowWidth - row.Length) / 2, i);
                Console.WriteLine(row);
                row = "";
            }