CC5.2.java

    public static String toBinary(double num) {
        if (num >= 1 || num < 0) {
            return "ERROR";
        }
        StringBuffer sb = new StringBuffer();
        sb.append("0.");
        int i;
        for (i = 0; i < 32 && num != 0; i++) {
            if (num >= 0.5) {
                sb.append(1);
                num -= 0.5;
            } else
                sb.append(0);
            num *= 2;
        }
        if (i == 32 && num != 0)
            return "ERROR";
        else
            return sb.toString();
    }