How can I make a textile in a FLTK executable in main(), so when opening the program, and put text in it? The standard way via ofstream does not work now.
The code I want to elaborate on is on this website:

Now when I add

ofstream myfile; ("example.txt");
myfile << "Writing this to a file.\n";

in the main() method, there is not made a file into the directory when running the executable. I use

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

at the beginning of the file. Compiling using
fltk-config --compile test.cxx
g++ test.cxx fltk-config --cxxflags --ldflags -o test
is already tried.

Does someone know why and how to get it working?

What are the compiler outputs? Are you getting errors? The file "example.txt" should appear in the same directory you run the executable from, not necessarily in the directory where the executable "test" exists. How did you run the executable?

The program is compiling normally, without errors. Running the executable by double-clicking on it. It is not a command-line executable.