Simple Java program to calulate compositorial of given non-negative integer.

import java.util.Scanner;

// 2018 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net
public class Main {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        int n;

        System.out.println("Enter a number: ");
        n = reader.nextInt(); //Reads integer from keyboard

        System.out.println("Compositorial of: " + n + " is equal to: " + compositorial(n));
    }

    private static int compositorial(int n){
        int comp = 1;
        int counter = 0;
        int i = 1;

        while (counter < n){
            if(isComposite(i)){
                comp *= i;
                ++counter;
            }

            ++i;
        }

        return comp;
    }

    private static boolean isComposite(int n){
        if(n < 4){
            return false;
        }

        for(int i = 2; i < Math.sqrt(n) + 1; ++i){
            if(n % i == 0){
                return true;
            }
        }

        return false;
    }
}

 



Java Int Compositorial
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