题解 | #整数与IP地址间的转换#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        String ipStr = in.nextLine();
        String[] arrStr = ipStr.split("\\.");
        Long sum = 0L;
        for(int i = 0; i < arrStr.length; i++){
            String s = arrStr[i];
            Long num = Long.valueOf(s);
            num = num << 8 * (3 - i);
            sum = sum + num;
        }

        String ipNumStr = in.nextLine();

        long ipNum = Long.valueOf(ipNumStr);
        
        String outStr = new String();


        long i1 = ipNum & 0xFF000000;
        long i2 = ipNum & 0xFF0000;
        long i3 = ipNum & 0xFF00;
        long i4 = ipNum & 0xFF;

        long temp;
        temp = i1 >> 8 * 3;
        outStr = String.valueOf(temp);
        temp = i2 >> 8 * 2;
        outStr = outStr + "." + temp;
        temp = i3 >> 8;
        outStr = outStr + "." + temp;
        temp = i4;
        outStr = outStr + "." + temp;

        System.out.println(sum);
        System.out.println(outStr);


    }
}