P2C2: C Sharp Program - Factorial using Recursion and Iteration

//Source Code using Recursion
using System;

public class Recursion_Factorial
{
   static long Factorial(int num)
    {
        if (num <= 1)
            return 1;
        return num * Factorial(num - 1);
    }

    public static void Main()
    {
        int num;
        long fact=1;

        Console.WriteLine("Enter a Number");
        num=Convert.ToInt32(Console.ReadLine());

        fact = Factorial(num);
     
        Console.WriteLine("Number = {0} and Factorial = {1}",num,fact);
        Console.WriteLine("\nPress any key to exit...");
        Console.ReadLine();

    }
}

OUTPUT:

Enter a Number
6
Number = 6 and Factorial = 720

Press any key to exit...

-------------------------------------------------------------------------------------

//Using Iteration Method
using System;

public class Program_Factorial_Iteration
{
   public static void Main()
    {
        int num;
        long ans;

        Console.WriteLine("Enter any number: ");
        num = Convert.ToInt32(Console.ReadLine());

        ans = factorial(num);
        Console.WriteLine("Factorial of " + num + " = " + ans);
       
        Console.WriteLine("\n\nPress any key to exit...");
        Console.ReadLine();
    }

   static long factorial(int n)
   {
       long fact;
       if (n <= 1)
           return 1;
       else
       {
           fact = 1;
           
           for (int i = n; i > 0; i--)
           {
               fact = fact * i;
           }
           return fact;
       }      
   }
}

OUTPUT:

Enter any number:

5

Factorial of 5 = 120

Press any key to exit...