hdoj/section2-1/main.cpp

#include <iostream>
#include <string>

using namespace std;

int main() {
    string stringA, stringB;
    while (cin >> stringA >> stringB){
        char *charA, *charB;
        charA = (char *) stringA.data();
        charB = (char *) stringB.data();

        int a, b;
        sscanf(charA, "%x", &a);
        sscanf(charB, "%x", &b);
        cout << a + b << endl;
    }
}