Factorial java

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Factorial java

What is factorial?

Factorial is nothing but the product of all numbers less than or equal to given number. For example

5! = 5 * 4 * 3 * 2 * 1 = 120 (5! means 5 factorial)

4! = 4 * 3 * 2 * 1 = 24 (4! means 4 factorial)

Factorial using for loop

public class FactorialDemo
{
   public static void main(String[] args)
   {
      int number = 6, factorial = 1; 
      for(int a = 1; a <= number; a++)
      {
         factorial = factorial * a;
      }
      System.out.println("Factorial of " + number + " is : " + factorial);
   }
}

Output:

Factorial of 6 is : 720


Factorial using recursion

public class FactorialRecursion
{
   public static void main(String[] args)
   {
      int factorial = 1; 
      int number = 6; 
      factorial = factorialFunction(number); 
      System.out.println("Factorial of " + number + " is : " + factorial);
   }

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

Output:

Factorial of 6 is : 720


Factorial using while loop

Also read – sum and average of values in an array in java

import java.util.Scanner;

public class FactorialWhile
{
   public static void main(String[] args)
   {
      int number, factorial = 1; 
      Scanner sc = new Scanner(System.in);
      System.out.println("Please enter a number to find its factorial : "); 
      number = sc.nextInt();
 
      int a = 1;
      while(a <= number)
      {
         factorial = factorial * a;
         a++;
      }
      System.out.println("Factorial of " + number + " is : " + factorial);
      sc.close();
   }
}

Output:

Please enter a number to find its factorial : 5
Factorial of 6 is : 120


Factorial program in java using do while loop

import java.util.Scanner;

public class FactorialDoWhile
{
   public static void main(String[] args)
   {
      int number, factorial = 1; 
      Scanner sc = new Scanner(System.in);
      System.out.println("Please enter a number to find its factorial : "); 
      number = sc.nextInt();
 
      int a = 1; 
      do
      {
         factorial = factorial * a;
         a++;
      }
      while(a <= number); 
      System.out.println("Factorial of " + number + " is : " + factorial);
      sc.close(); 
   }
}

Output:

Please enter a number to find its factorial : 7
Factorial of 7 is : 5040


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