C# - Factorial of a given number

In this article, we will calculate the factorial of a given number using C#

What is meant by factorial of a number?

The product of an integer and all the integers below it; e.g. factorial four ( 4! ) is equal to 24.

class Program

    {

        static void Main(string[] args)

        {

            #region Factorial

            Console.WriteLine("Factorial of :");

            int numm = int.Parse(Console.ReadLine());

            Console.WriteLine(PrintFactorial(numm));

            Console.ReadKey();

            #endregion

        }

#region Factorial

        private static double PrintFactorial(int num)

        {

            double fact = 1;

            #region using For Loop

            for (int i = num; i >= 1; i--)

            {

                fact = fact * i;

            }

            #endregion

            #region using While Loop

            while (num > 0)

            {

                fact = fact * num;

                num--;

            }

            #endregion

            return fact;

        }

        #endregion

}

Console Output:

Factorial of :

4

24