Beginner Question - Linking a data file

I've just begun to teach myself C++ and am using the DevC++ compiler. I've been trying to discover how to build and link a data file to a C++ program (the program calc's gross tonnage of a seagoing vessel) in DevC. Their website is not helping me. Can anyone here point me in the correct direction or give me a clue as to how I can create a data file???

You create a data file with something along these lines:

Code:

---

#include <iostream>

...
  std::ostream astream("outfile.txt");
  astream << "This is my data" << std::endl;

---

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Mats