// using ofstream constructors.
#include <iostream>
#include <fstream>

std::ofstream outfile ("test.txt");

outfile << "my text here!" << std::endl;

outfile.close();

#include <iostream>
#include <fstream>

int main() {
  std::ofstream o("Hello.txt");

  o << "Hello, Worldn" << std::endl;

  return 0;
}

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

string filename = "/tmp/filename.txt";

int main() {
  std::ofstream o(filename.c_str());

  o << "Hello, Worldn" << std::endl;

  return 0;
}