use recursion to print out the binary representation of an integer

BP.java

public class BP
{
    public static String binary(int N)
    {
	if(N / 2 == 0) return "" + N;
	return binary(N/2) + "" + N % 2;
    }
    public static void main(String[] args)
    {
	int N = Integer.parseInt(args[0]);
	String a = binary(N);
	StdOut.println(a);
    }
}