ReverseNums Recursion2

public class ReverseNum {
    public static int nlen(int n)
    {
        if (n<10)
            return 1;
        return 1+nlen(n/10);
    }

    public static int ex4(int n)
    {
        if (n<10)
            return n;
        return (n%10*(int)Math.pow(10,nlen(n)-1))+ex4(n/10);
    }
}