using System;                   

public class Program

{

    public static void Main()

     {      Console.WriteLine("=========static test==========");

            Console.WriteLine(factorial_Recursion(4));

            Console.WriteLine(factorial_Recursion(5));

            Console.WriteLine("========dynamic test===========");

         double acc=0;

           for(var i=1;i<7;i++){

                 acc += factorial_Recursion(i);

                 Console.WriteLine("เรียกครั้งที่ "+ i +" ค่าคือ {0} ผลรวมสะสม = {1}", factorial_Recursion(i),acc);

           }

        }

​

     public static double factorial_Recursion(int number)

        {

            if (number == 1)

                return 1;

            else

                return number*factorial_Recursion(number - 1);

        }

}

/* java script

function factorial(num) {

    // Base case

    if (num === 0) {

      return 1;

    }

    // Recursive case

    return num * factorial(num - 1);

  }  

  console.log(factorial(4)); // Output: 4x3x2x1 =24

*/