How to use fstream, to write different values in a .txt file

Question

The problem I am facing is the following: if we define something like

ofstream myFile; 

    myFile.open("Directory//debug.txt");
    for (int i = 0; i < 10; i++)
    {
     myFile << i << endl;
     myFile.close(); 
    }

the output in the debug file will be 9. I want to make it so that it outputs all the numbers from 0 to 9. Aside from closing the file after the for statement is it possible to define an ofstream that would do that?

Answer 1

No. You have two options:

Close the file outside the loop:

myFile.open("Directory//debug.txt");
for (int i = 0; i < 10; i++)
{
    myFile << i << endl;
}
myFile.close();

or open the file in append mode and close inside the loop:

for (int i = 0; i < 10; i++)
{
    myFile.open("Directory//debug.txt", ios_base::app);
    myFile << i << endl;
    myFile.close(); 
}