basic function tell an function

hello,

i try to write an my_files.txt

and see the output on tty

i see on tty, but no write my_files.txt


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

bool var_fonction_un = false;
bool var_fonction_deux = false;

int age=25;
int bd=100;


bool fonction_un() {
        cout << "chocolat" << endl;;
        cout << "chocolat " << age << "ans" << endl;
        cout << "chocolat a environ " << bd << " bandes-dessinées." <<
endl;
	
	var_fonction_un = true; 
        return var_fonction_un;
}

bool fonction_deux (){
	fstream my_file;
	my_file.open("my_file.txt", ios::out);
	if (!my_file) {
		cout << "File not created!";
	}
	else {
		cout << "File created successfully!\n" << endl;
 		cout << fonction_un() << endl;

	my_file.close();
	}
	var_fonction_deux = true;
	return var_fonction_deux;
}

int main() {
	fonction_deux();	

	return 0 ;
}

--

https://bpa.st/3PM5U <-- work

Anyone know why my program doesn't write my_file.txt?