#include<iostream>
#include<sstream>
#include<string>

using namespace std;

int main()
{
  //istringstream istr;
  //istr.str("vfvjbj vdfx7");
  ////上述两个过程可以简单写成 istringstream istr("1 56.7"); 
  //cout << istr.str() << endl;
  //string a;
  //string b;
  //istr >> a;
  //cout << a << endl;
  //istr >> b;
  //cout << b << endl;

  //ostringstream ostr;
  //ostr.str("abcmmmm");//如果构造的时候设置了字符串参数,那么增长操作的时候不会从结        尾开始增加,而是修改原有数据,超出的部分增长 
  //ostr.put('d');
  //ostr.put('e');
  //ostr << "fg";

  //string gstr = ostr.str();
  //cout << gstr<<endl;
  
  //stringstream ostr("ccccccc kfgdgfdlk");
  //ostr.put('d');
  //ostr.put('e');
  //ostr << "fg";
  //string gstr = ostr.str();
  //cout << gstr << endl;

  //string a;
  //ostr >> a;
  //cout << a<<endl;

  stringstream ss;
  ss << "hello world ";
  string s = ss.str();
  cout <<s<< endl;

  system("pause");
  return 0;
}