1.22

#include<iostream>#include"Sales_item.h"using namespace std;int main(){Sales_item total;if (cin >> total){Sales_item trans;while (cin >> trans){if (trans.isbn == total.isbn)total += trans;else{cout << total << endl;total = trans;}}cout << total << endl;}else{cerr << "No data!" << endl;//输出警告和错误信息}return 0;}