Question

How to calculate factorial of a number using recursion in C#

Answer 1

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Console.Write("Enter a number: ");
                int n = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("Factorial of {0} is: {1}", n, recursiveFactorial(n));
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
        static long recursiveFactorial(int n)
        {
            if (n == 0)
                return 1;
            else
                return (n * recursiveFactorial(n - 1));
        }
    }
}

/*
run:
   
Enter a number: 5
Factorial of 5 is: 120
  
*/

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Answer 2

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Console.Write("Enter a number: ");
                int n = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("Factorial of {0} is: {1}", n, recursiveFactorial(n));
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
        static long recursiveFactorial(int n)
        {
            return ( (n <= 1) ? 1 : (n * recursiveFactorial(n - 1)) ); 
        }
    }
}

/*
run:
    
Enter a number: 5
Factorial of 5 is: 120
   
*/

 

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