输出杨辉三角

        /// <summary>
        /// 打印杨辉三角
        /// </summary>
        /// <param name="lines">行数</param>
        private static void Print(int lines)
        {
            //二维数组用于存储数据
            int[][] array = new int[lines][];
            //初始化前两行
            array[0] = new int[] { 1 };
            array[1] = new int[] { 1, 1 };
            for (int i = 2; i < lines; i++)
            { 
                array[i]=new int[i+1];
                for (int j =1; j < i; j++)
                {
                    array[i][j] = array[i - 1][j - 1] + array[i - 1][j];
                }
                //将每行第一列和最后一列置为1
                array[i][0] = 1;
                array[i][i] = 1;
            }
            PrintArray(array);
        }

        /// <summary>
        /// 打印数组
        /// </summary>
        /// <param name="array"></param>
        private static void PrintArray(int[][] array)
        {
            for (int i = 0; i <= array.Length - 1; i++)
            {
                //打印前面空格
                for (int j = array.Length -array[i].Length; j > 0; j--)
                {
                    Console.Write("  ");
                }
                //打印数据
                for (int j = 0; j < array[i].Length; j++)
                {
                    Console.Write(array[i][j] + "   ");
                }
                //换行
                Console.WriteLine();
            }    
        }