用C#编写程序输出菱形

用C#编写程序输出菱形，程序如下

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace gragh
{
    class Program
    {
        static void Main(string[] args)
        {
           

            int rows = 4;
            for (int i = 1;i <=rows;i++)
            {
                for (int j=1; j <= rows - i; j++)
                {
                    Console.Write(" ");
                }
                for (int k = 1; k <= 2 * i - 1; k++)
                {
                    Console.Write("*");
                }
                Console.Write("\n");

            }
            for (int ii = rows-1; ii >=1; ii--)
            {
                for (int jj = 1; jj <= rows-ii; jj++)
                {
                    Console.Write(" ");
                }
                for (int kk = 1; kk <= 2 * ii - 1; kk++)
                {
                    Console.Write("*");
                }
                Console.Write("\n");
            }
        }
    }
}