namespace 打印正三角
{
    class Program
    {
        static void Main(string[] args)
        {

            Console.WriteLine("请输入要打印的行数：");
            int n=Convert.ToInt32(Console.ReadLine());
            Console.Clear(); //清除以上显示的内容

            //这层循环控制打印的行数
            for (int i = 1; i <= n; i++) 
            {
                //这层循环控制每行前面打印的空格数
                for (int k = 1; k <= n - i; k++) 
                {
                    Console.Write(" ");
                }

                //这层循环控制每行前面打印*的个数
                for (int j = 1; j <= 2 * i - 1; j++)
                {
                    Console.Write("*");

                }

                //每打印完一行换一下行
                Console.Write("\n");
            }

            Console.ReadKey();

        }
    }
}