近期公司组织C#初级培训，写了个程序练手。

 

 int n;//菱形上半部分的行数

            Console.WriteLine("请输入一个大于或等于3的奇数");

            n = int.Parse(Console.ReadLine());

            if (n % 2 == 0 || n < 3)

            {

                Console.WriteLine("您输入的值非法请重新输入!");

                Console.ReadKey();

            }

            //上半部分输出n行

            for (int i = 1; i <= n; i++)

            {

                //输出每一行的内容

                for (int j = 1; j <= n + i - 1; j++)

                {  //每行输出内容的具体位置

                    if ((j != n - i + 1) && (j != n + i - 1))

                        Console.Write(" ");

                    else

                        Console.Write("*");

                }

                Console.Write("\n");

            }

            //下半部分输出n-1行

            for (int i = n - 1; i >= 1; i--)

            {

                for (int j = n * 2 - 1; j >= 1; j--)

                {

                    if ((j != n + i - 1) && (j != n - i + 1))

                        Console.Write(" ");

                    else

                        Console.Write("*");

                }

                Console.Write("\n");

            }

            Console.ReadKey();