A + B Again 2057 有符号的64进位的运算

[align=left]Problem Description[/align]
There must be many A + B problems in our HDOJ , now a new one is coming.
Give you two hexadecimal integers , your task is to calculate the sum of them,and print it in hexadecimal too.
Easy ? AC it !

[align=left]Input[/align]
The input contains several test cases, please process to the end of the file.
Each case consists of two hexadecimal integers A and B in a line seperated by a blank.
The length of A and B is less than 15.

[align=left]Output[/align]
For each test case,print the sum of A and B in hexadecimal in one line.

[align=left]Sample Input[/align]

+A -A
+1A 12
1A -9
-1A -12
1A -AA

[align=left]Sample Output[/align]

0
2C
11
-2C
-90

[align=left]Author[/align]
linle

[align=left]Source[/align]
校庆杯Warm Up

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#include<stdio.h>
int main()
{
long long int x,y,z;
while(~scanf("%llx%llx",&x,&y))
{
(x+y>=0)?printf("%llX\n",x+y):printf("-%llX\n",-(x+y));
}
return 0;
}