In this article we will learn about Factorial in csharp. Factorial of a number is obtained from the result of multiplying a series of descending natural numbers. Please read the previous article of Prime Number in csharp.
What is Factorial number?
Factorial of a number is obtained from the result of multiplying a series of descending natural numbers. Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!.
Example:
5! = 5*4*3*2*1 = 120 6! = 6*5*4*3*2*1 = 720
Here, 5! is pronounced as “5 factorial”, it is also called “5 bang” or “5 shriek”.The factorial is normally used in Combinations and Permutations (mathematics).
For more details about C#, please visit the official Microsoft link.
3 Different ways to calculate Factorial in csharp
Using For Loop
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();
}
}
}Output:
Enter the Number: 5 Factorial of Given Number is: 120
Using Recursion
class Program
{
static void Main(string[] args)
{
int number;
Console.WriteLine("Enter the Number");
number = int.Parse(Console.ReadLine());
double fact;
fact = factorial_Recursion(number);
Console.WriteLine("\nFactorial of Given Number is: " + fact);
Console.ReadLine();
}
public static double factorial_Recursion(int number)
{
if (number == 1)
return 1;
else
return number * factorial_Recursion(number - 1);
}
}Output:
Enter the Number: 8 Factorial of Given Number is: 40320
Using While Loop
class Program
{
static void Main(string[] args)
{
int number;
Console.WriteLine("Enter the Number");
number = int.Parse(Console.ReadLine());
double fact;
fact = factorial_Recursion(number);
Console.WriteLine("\nFactorial of Given Number is: " + fact);
Console.ReadLine();
}
public static double factorial_Recursion(int number)
{
if (number == 1)
return 1;
else
return number * factorial_Recursion(number - 1);
}
}Output:
Enter the Number: 4 Factorial of Given Number is: 24
Hope It will clear about the Factorial in C#. Still have any question regarding this please give feedback.