public static void main(String args[]){
        NotIncluding4 ni = new NotIncluding4();
        System.out.print(ni.number(16));
    }
http://saikatd.wordpress.com/author/saikatd/page/4/
In a number system where 4 is not there, how do you convert such a number system to decimal
Here basically we have base 9 and convert it to base 10. Just be careful when you convert
anything from 5 to 9 because they are basically 4 to 8 in base 9 system. So subtract them 
by 1 when doing multiplications.
src/com/interview/number/NotIncluding4.java