practica 6.1 consola

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

namespace practica_6._1_consola
{
class Program
{
static void Main(string[] args)
{
double n, i, factor = 1.0;
Console.WriteLine("\n\nINTRODUCE EL VALOR DEL FACTORIAL");
n = double.Parse(Console.ReadLine());
for (i = n; i >= 1; i--)
{
factor = factor * i;
}
Console.WriteLine("\n\nEL FACTORIAL ES: {0}", factor);
Console.ReadLine();
}
}
}