istringstream和ostringstream的实现

ostringstream是将数据写入string里边的，istringstream是将从string里边读出数据的；

#include <sstream>
int main()
{    std::ostringstream ostr;
    while(std::cin)
    {
        std::string str;
        std::cout << "next word :";
        std::cin >> str;
        if(str == "done")
        {
            break;
        }
        ostr << str << " ";
    }
    std::cout << "The result is : " << ostr.str() << std::endl;
    return 0;

}

输入:

a

bc

d

ef

done

结果是：

a bc d ef