class jinzhi_lj {
    public static void main(String[] args) {
        int n = 15;
        int x=0;
        int i=0;
        while (n > 0) {
            x = (int) (x + (n % 2) * Math.pow(10,i));
            n = n / 2;
            i=i+1;
        }
        System.out.print("十进制n转换二进制a为：" + x);
    }
}