编写程序，将来自文件中的行保存在一个vector<string>，然后使用一个istringstream 从vector中读取数据，每次读一个单词

#include<fstream>
#include <vector>
#include<string>
#include<iostream>
#include <sstream>
#include <stdexcept>
using namespace std;

/*istream & f(istream&in){
	string v;
	while (in>>v,!in.eof())
	{
		if (in.bad())
			throw runtime_error("IO流错误");
		if (in.fail()){
			cerr << "数据错误，请重试" << endl;
			in.clear();
			in.ignore(100, '\0');
			continue;
		}
		cout << v << endl;
	}
	in.clear();
	return in;
}*/

int main()
{
	ifstream in("data.txt");
	if (!in){
		cerr << "无法打开文件" << endl;
		return -1;
	}

	string line;
	vector<string>words;
	while (getline(in, line))
		words.push_back(line);
	in.close();
	vector<string>::const_iterator it = words.begin();
	while (it != words.end()){
		istringstream line_str(*it);
		string word;
		while (line_str >> word)
			cout << word << " ";
		cout << endl;
		++it;
	}
	system("pause");
	return 0;
}