Method longToIP

java/751_IP_to_CIDR.java:21–24

(long x)

        return ans;
    }
    private String longToIP(long x) {
        return String.format("%s.%s.%s.%s",
            x >> 24, (x >> 16) % 256, (x >> 8) % 256, x % 256);
    }
    private int bitLength(long x) {
        if (x == 0) return 1;
        int ans = 0;