for嵌套for ★

namespace for嵌套for五角星
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                string a = "★";                    //注意换行与不换行的应用，如果要去掉对角线的话往上的话只要j<=i即可。
               
                for (int i = 1; i <=5; i++)
                {
                    for (int j = 1; j <= i; j++)
                    {
                        Console.Write(a);
                    }
                    Console.WriteLine();
                }
               
                 Console.ReadLine();
            }
        }
    }
}

for嵌套for ★

原文：http://www.cnblogs.com/lk-kk/p/4382100.html