public static void factorial() {
        Scanner scanner=new Scanner(System.in);
        int a;
        int fac = 1;
        System.out.println("Kiritilgan sonni faktorialini aniqlash!");
        System.out.print("Sonni kiriting: ");
        a=scanner.nextInt();
        for (int i = 1; i <= a; i++) {
            fac=fac*i;
        }
        System.out.println(fac);
    }