c++ file i/o programming help needed

rajorshi · 09-13-2003, 02:30 PM

Hi all,
I'm new to standard C++. I seem to have a problem:
Whenever I create a file in Linux (gcc 3.2.2) as follows:

fstream f;
f.open("somefile.dat",ios::app|ios::in|ios::ate);

the file does not get created (f remains null). However
if I use 'touch' to create the file beforehand, it
succeeds. The code above was found in two textbooks
I am referring to.

Am I doing something obviously wrong ? I use Slack 9.0
and was coding in a non-root account.

Please help!

kev82 · 09-13-2003, 02:40 PM

your passing the flag ios::in therefore you are opening the file for reading, what would be the point of creating the file because it would be empty. use ios::out if you want to output to the file(creating it if not already present)