Dev - C++ - ayuda por favor

#include <iostream>     // std::cout

#include <fstream>      // std::ofstream

int main ()

{

    std::ofstream ofs;

    ofs.open ("Alumno.txt");

    if (ofs.is_open())

    {

        ofs << "Alumno: Roberto";

        ofs.close();

    }

    else

    {

        std::cout << "Error abriendo Alumno.txt";

    }

    return 0;

}