Save string with ostringstream : ostrstream « File Stream « C++ Tutorial

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2. File Stream
3. ostrstream

#include <iostream>
#include <sstream>

using namespace std;

int main(int argc, char** argv)
{
  cout << "Enter tokens. Control-D (Unix) or Control-Z (Windows) to end." << endl;

  ostringstream outStream;

  while (cin) {
    string nextToken;

    cout << "Next token: ";
    cin >> nextToken;

    if (nextToken == "done") break;

    outStream << nextToken << "\t";        
  }

  cout << "The end result is: " << outStream.str();
}