Question

I’ve done this before, but can’t find the sample code…still new to c++.

I need to output multiple lines to a text file. Right now it only outputs the last line, so I assume its overwriting the prior line each time the loop is run. How do I get it to output a line and then output to the next line, etc. without writing over the prior line?

Here’s a snippet:

    int main()
{
    int n = 1;

    while (n <= 100)
    {
        int argument = 0 + n;

        ofstream textfile;
        textfile.open ("textfile.txt");
        textfile << argument << endl;
        textfile.close();

        ++n;
    }

    return 0;
}

Answer 1

Open the file before you enter the loop, and close it after you exit the loop.