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Factorial Calculator using C# July 1, 2018 Mahedee Fb-Button

Factorial is a positive number which is the product of all number less than or equal to that positive number. For example:

0! = 1
1! = 1
2! = 2 * 1! = 2
3! = 3 * 2! = 6

n! = n * (n – 1)!

Here is the sample code to calculate Factorial using both loop and recursion using c#.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Factorial01
{
    /// <summary>
    /// Author: Md. Mahedee Hasan
    /// </summary>
    class Program
    {
        static void Main(string[] args)
        {
            int number = 0;
            Console.WriteLine("Enter an integer number to calculate factorial: ");
            Int32.TryParse(Console.ReadLine(), out number);

            Console.WriteLine("Factorial of " + number + " is (using loop): " + CalculateFactoial(number));
            Console.WriteLine("Factorial of " + number + " is (Using recursion): " + Factorial(number));
            Console.ReadLine();
        }

        //Calculate factorial using loop

        private static int CalculateFactoial(int number)
        {
            int factorial = 1;
            for (int counter = 1; counter <= number; counter++)
            {
                factorial = factorial * counter;
            }
            return factorial;
        }

        //Calculate factorial using recursion
        private static int Factorial(int number)
        {
            if (number == 0)
                return 1;
            else
                return number * Factorial(number - 1);
        }
    }
}

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