C#

using System;

using System.Collections.Generic;

using System.Text;



namespace ConsoleApplication1
{

    class Program
    {



        static int Fact(int n)
        {

            if (n <= 1)

                return 1;

            return n * Fact(n - 1);

        }



        static int Factorial(int n)
        {

            if (n <= 1)

                return 1;

            int result = 1;


            {
 for (int i = 2; i <= n; i++)
                result = result * i;

            }

            return result;

        }





        static void Main(string[] args)
        {





            Console.Write("Enter a Number to find factorial: ");

            int n = Convert.ToInt32(Console.ReadLine());

            int r = Fact(n);

            Console.WriteLine(n.ToString() + "! = " + r.ToString());



            Console.Write("Enter a Number to find factorial: ");

            n = Convert.ToInt32(Console.ReadLine());

            r = Factorial(n);

            Console.WriteLine(n.ToString() + "! = " + r.ToString());

            Console.Write("Enter a Number to find factorial: ");

            n = Convert.ToInt32(Console.ReadLine());

            r = Factorial(n);

            Console.WriteLine(n.ToString() + "! = " + r.ToString());

            Console.Write("Enter a Number to find factorial: ");

            n = Convert.ToInt32(Console.ReadLine());

            r = Factorial(n);

            Console.WriteLine(n.ToString() + "! = " + r.ToString());

            Console.Write("Enter a Number to find factorial: ");

            n = Convert.ToInt32(Console.ReadLine());

            r = Factorial(n);

            Console.WriteLine(n.ToString() + "! = " + r.ToString());


            Console.ReadLine();
        }

    }

}