344. while과 나머지로 2진수 만들기

1public class Main {
2    public static void main(String[] args) {
3        int n = 13;
4        String bits = "";
5        while (n > 0) {
6            bits = (n % 2) + bits;
7            n = n / 2;
8        }
9        System.out.println(bits);
10        int m = 0;
11        for (int i = 0; i < bits.length(); i++) {
12            m = m * 2 + (bits.charAt(i) - '0');
13        }
14        System.out.println(m + 1);
15    }
16}