Calculate the factorial of a number

Create a C# program that implements a recursive function that receives a requested number from the user and returns the factorial of that number. You must calculate the factorial of the number using recursion.

Input

6

Output

720

Solution

using System;
public class CalculateFactorial
{
    public static void Main(string[] args)
    {
        int num = Convert.ToInt32(Console.ReadLine());
        Console.WriteLine(Factorial(num));
    }

    public static int Factorial(int num)
    {
        if (num == 0)
        { 
            return 1;
        }
        else
        { 
            return num * Factorial(num - 1);
        }
    }
}