این رو نوشتم ببین خوبه؟ 
using Systemu;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace variables
{
class demo
{
static void Main(string[] args)
{
Console.WriteLine("enter value of n");
string n = Console.ReadLine();
if (! n.Contains ('.'))
{
for (int i = Convert.ToInt32(n); i >= 1; i--)
{
Console.WriteLine(" ");
for (int j = 1; j <= i; j++)
{
Console.Write(" ");
}
for (int q = i; q <= Convert.ToInt32(n); q++)
{
Console.Write("*");
}
}
}
else
{
Console.WriteLine(" lotfan addade sahih vared konid!!!! ");
Console.WriteLine("enter value of n");
n = Console.ReadLine();
if (!n.Contains('.'))
{
for (int i = Convert.ToInt32(n); i >= 1; i--)
{
Console.WriteLine(" ");
for (int j = 1; j <= i; j++)
{
Console.Write(" ");
}
for (int q = i; q <= Convert.ToInt32(n); q++)
{
Console.Write(" * ");
}
}
}
}
Console.ReadLine();
}
}
}