[Jumpstart C#] loops demo - FactorialDoWhile

using System;
using System.Numerics;


class Factorial
{
    static void Main()
    {
        Console.Write("n = ");
        uint n = UInt32.Parse(Console.ReadLine());
        uint originalN = n;
        //decimal factorial = 1;
        BigInteger factorial = 1;

        do
        {
            factorial *= n;
            n--;
        }
        while (n > 1);

        Console.WriteLine("{0}! = {1}", originalN, factorial);
    }
}