gistfile1.java

    public static void main(String[] args) {
        System.out.println(String.format("10 is power of two = %s", isPowerOfTwo(10)));
        System.out.println(String.format("8 is power of two = %s", isPowerOfTwo(8)));
        System.out.println(String.format("-3 is power of two = %s", isPowerOfTwo(-3)));
        System.out.println(String.format("3.14 is power of two = %s", isPowerOfTwo(3.14f)));
    }

    public static boolean isPowerOfTwo(float arg) {
        if (Math.floor(arg) != arg) {
            return false;
        }
        if (arg == 1) {
            return true;
        }

        return isPowerOfTwo(arg / 2);
    }