#include <iostream>

 #include <fstream>

 #include "test.h"

 using namespace std;

 int main(int argc, char** argv)

 {

     ifstream input(argv[]);

     Sales_data total;

     if (read(input, total)) {

         Sales_data trans;

         while (read(input, trans)) {

             if (total.isbn() == trans.isbn()) {

                 total.combine(trans);

             }

             else {

                 print(cout, total) << endl;

                 total = trans;

             }

         }

         print(cout, total) << endl;

     }

     else {

         cerr << "No data?!" << endl;

     }

     return ;

 }