Program for 3 Different ways to calculate factorial in C#

Factorial of a number is obtained from the result of multiplying a series of descending natural numbers.

This C# Program generates Factorial of the Number obtained from the user.

1. Using For Loop:

/*
 * C# Program to Generate the Factorial of  Given Number 
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
 
namespace factorial
{
    class Program
    {
        static void Main(string[] args)
        {
            int i, number, fact;
            Console.WriteLine("Enter the Number");
            number = int.Parse(Console.ReadLine());
            fact = number;
            for (i = number - 1; i >= 1; i--)
            {
                fact = fact * i;
            }
            Console.WriteLine("\nFactorial of Given Number is: "+fact);
            Console.ReadLine();
 
        }
    }
}

Here is the output of the C# Program:

Enter the Number 5 Factorial of Given Number is: 120

You can calculate factorial using recursion and while loop also.

2. Using Recursion:

public double factorial_Recursion(int number)
{
    if (number == 1)
        return 1;
    else
        return number * factorial_recursion(number - 1);
}

3. Using While loop:

public double factorial_WhileLoop(int number)
{
    double result = 1;
    while (number != 1)
    {
        result = result * number;
        number = number - 1;
    }
    return result;
}

Source: csharpstar

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