将一个正整数分解质因数

public static void main(String[] args) {
        
        System.out.println("请输入一个正整数");
        Scanner input = new Scanner(System.in);
        int num = input.nextInt();
        for (int i = 2; i <= num; i++) {
            while (num % i == 0 && (num != i)) {
                System.out.print(i + "*");
                num /= i;
            }
        }
        System.out.println(num);
    }