[Meir]

פשוט מאוד:

        int num = 134, tofind = 3, index = -1, tmp = num;
        for (int i = 0; num != 0; i++)
        {
            if (num%10 == tofind) index = 1;
            num /= 10;
        }
        if (index == 1)
        {
            System.out.print("Result: " + (tmp*10+tofind));
        }