Method bitLength

java/751_IP_to_CIDR.java:25–33

(long x)

            x >> 24, (x >> 16) % 256, (x >> 8) % 256, x % 256);
    }
    private int bitLength(long x) {
        if (x == 0) return 1;
        int ans = 0;
        while (x > 0) {
            x >>= 1;
            ans++;
        }
        return ans;
    }
}