How do I write a superfactorial program?

Question

Write a program to calculate and print the super factorial of a number using a for loop. The factorial of a number is the product of all integers up to and including that number, so the factorial of 4 (written as 4!) is 4*3*2*1= 24.

The super factorial is the product of all factorials up to and including that factorial.

4!!=4!*3!*2!*1!

I found "factorial" using the following code:

import java.util.Scanner;
public class superfactorial {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner (System.in);

        // number whose factorial to be found
        int number;
        // prompting input
        System.out.print("Enter number: ");
            number = input.nextInt();

        int factorial = factorial(number);

        System.out.printf("the factorial of %d is %d", number , factorial);
    }

    // method that calculates the factorial
    public static int factorial (int n){
        int output = 1; 
        for (int i=1; i <= n; i++) {
            output = output * i;                
        }
            return output;
    }
}

Answer 1

The most important line in your factorial method is this line:

output = output * i;

You multiply output by i where i is an integer that keeps increasing by one.

What's the difference between a superfactorial and a normal factorial? To evaluate a superfactorial, you multiply output not by i, but by the factorial of i, right?

So just do it! I have already explained the whole thing to you! Just create a new method called superfactorial, copy all the stuff from the factorial method and change this line:

output = output * i;

to this:

output = output * factorial(i);