java program to find factorial of a number code example

Example 1: java program to find factorial of a number

import java.math.BigInteger;

public class Factorial {

    public static void main(String[] args) {

        int num = 30;
        BigInteger factorial = BigInteger.ONE;
        for(int i = 1; i <= num; ++i)
        {
            // factorial = factorial * i;
            factorial = factorial.multiply(BigInteger.valueOf(i));
        }
        System.out.printf("Factorial of %d = %d", num, factorial);
    }
}

Example 2: java program to find factorial of a number

import java.util.Scanner;
public class FindingFactorial {
    public static void main(String[] args) {
        int num;
        System.out.println("Enter the number: ");
        Scanner in = new Scanner(System.in);
        num = in.nextInt();
        in.close();
        long fact = 1;
        int i = 1;
        while(i<=num)
        {
            fact = fact * i;
            i++;
        }
        System.out.println("Factorial of "+num+" is: "+fact);
    }
}

Example 3: how to make factorial in java

class fact{
	static int fac(int n){
		int ans =1;
		for(int i=1; i<=n; i++){
			ans = ans*i;
		}
		return ans;
	}

	public static void main (String[] args){
		int f = 5;
		System.out.println(fac(f));
	}
}

Example 4: Factorial program in java

// Factorial program 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));
      }
   }
}

Example 5: factorial program in java

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);
   }
}