A + B Again(HDUOJ)——Java

解法一：

import java.util.*;
import java.math.*;public class Main{public static void main(String[] args) {Scanner sc = new Scanner(System.in);while(sc.hasNext()) {long a = sc.nextLong(16);long b = sc.nextLong(16);if(a+b >= 0)System.out.printf("%X\r\n",a+b);elseSystem.out.printf("-%X\r\n",-(a+b));}sc.close();}
}

解法二：

import java.util.*;
public class Main
{public static void main(String _[]){Scanner s=new Scanner(System.in);while(s.hasNext()){long i = Long.parseLong(s.next().replaceAll("\\+",""),16)+   			Long.parseLong(s.next().replaceAll("\\+",""),16);//replaceAll("\\+","")，去除其中的‘+’，因为进制计算不支持带“+”的某一进制的数字字符串，‘-’可以，还需要判断正数负数if(i<0)System.out.println("-"+Long.toHexString(-i).toUpperCase());else    System.out.println(Long.toHexString(i).toUpperCase());}}
}