c++primer 第七章习题答案

7.7

//2018年8月17日 练习7.7
Sales_data total;
if (read(cin, total)) {
	sales_data trans;
	while (read(cin, trans)) {
		if (total.isbn() = trans.isbn()) {
			total.combine(trans);
		}
		else {
			print(cout, total) << endl;
		}
	}
	print(cout, total) << endl;
}
else {
	cerr << "no data?" << endl;
}

7.9

#include "stdafx.h"
#include "iostream"
#include "stddef.h"
#include "string"
#include
using namespace std;
//2018年8月17日 练习7.7

class person {
private:
	string name;
	string address;
public:
	istream &read(istream &is, person &item)
	{
		is >> item.name >> item.address;
		return is;
	}
	ostream &print(ostream &os, const person &item)
	{
		os << item.name << item.address;
		return os
	}
};

7.11

//2018年8月17日 练习7.7

class sales_data {
public:
	sales_