题解 | #整数与IP地址间的转换#

import java.util.Scanner;

// mark一下大佬的做法
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()) { 
            String ip = in.nextLine();
            String[] strings = ip.split("\\.");
            long ipNumRes = 0;
            for (String string : strings) {
                ipNumRes = ipNumRes * ((int) Math.pow(2, 8)) + Integer.parseInt(string);
            }
            System.out.println(ipNumRes);

            String ipNum = in.nextLine();
            long ipNumInput = Long.parseLong(ipNum);
            String ans = "";
            for (int i = 0; i < 4; i++) {
                ans = String.valueOf(ipNumInput % ((int) Math.pow(2, 8))) + "." + ans;
                ipNumInput /= (int) Math.pow(2, 8);
            }
            System.out.println(ans.substring(0, ans.length() - 1));
        }
    }
}