C++ Primer(第8章 IO库)

8.1

istream& iofunc(istream& is) {
	string s;
	while (is >> s) {
		cout << s << endl;
	}
	is.clear();
	return is;
}


int main() {

	iofunc(cin);
	system("pause");
	return 0;
}

8.4

vector<string>v;
ifstream ifs;
ifs.open("ifile.txt", ios::in);
if (ifs.is_open()) //if(ifs>>s)逐个单词
   {
	string s;
	while (getline(ifs,s)) {
		v.push_back(s);
		cout << s << endl;
	}
	ifs.close();
}

8.10

string line, word;
vector<string> vec;
while (getline(cin,line))
{	
	vec.push_back(line);
	cout << vec.back() << endl;
	istringstream record(vec.back());
	while (record >> word) {
		cout << word << endl;
	}
}

8.11

struct PersonInfo {
	string name;
	vector<string> phones;
};

int main() {
	string line, word;
	vector<PersonInfo> people;
	istringstream record;

	while (getline(cin, line)) {
		record.str(line);
		PersonInfo info;
		record >> info.name;
		while (record >> word) {
			info.phones.push_back(word);
		}
		record.clear();//复位
		people.push_back(info);
	}

	for (const auto &entry : people) {
		cout << entry.name << " ";
		for (const auto &ph : entry.phones) {
			cout << ph << " ";
		}
		cout << endl;
	}

	return 0;
}