打印多边形的菱形（for的嵌套）

            Console.WriteLine("请输入一个数字，会出现一个多边的菱形：");
            int n = Convert.ToInt32(Console.ReadLine());
            for (int i = 1; i <= n; i++)
            {
              for(int j=1;j<=n-i;j++)
              {
              Console.Write(" ");
              }
              for (int k = 1; k <= 2 * i - 1;k++ )
              {
                  Console.Write("*");
              }
                Console.Write("\n");

            }
            for (int o = 1; o <= n;o++)
            {
                for (int p = 1; p <= o;p++ )
                {
                    Console.Write(" ");
                }
                for(int q=1;q<=2*(n-o)-1;q++)
                {
                Console.Write("*");
                }
                Console.Write("\n");
            }
            Console.ReadLine();