public class FactorialCalculator {
    public static void main(String[] args) {
        int numberToCalculate = 5; // Change this to test different numbers.
        try {
            long factorialWithLoop = calculateFactorialWithLoop(numberToCalculate);
            System.out.println("Factorial of " + numberToCalculate + " using loop: " + factorialWithLoop);
            long factorialWithRecursion = calculateFactorialWithRecursion(numberToCalculate);
            System.out.println("Factorial of " + numberToCalculate + " using recursion: " + factorialWithRecursion);
        } catch (IllegalArgumentException e) {
            System.out.println(e.getMessage());
        }
    }
    public static long calculateFactorialWithLoop(int number) {
    	// Time complexity O(n)
        if (number 

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