I'm doing simple file i/o using Qt to test. I prompt the user for a file name, count the lines and output num of lines. The source and example text files are in the same directory. When I run this using Qt, in.open() fails. Running the same program from the terminal works.
I did notice that Qt works if I enter entire path at the prompt, so I copied the text file to the same directory but it doesn't open using just the file name.

Also, I'd like to see the console within the Qt IDE (like on a tab on the bottom) instead of opening a separate terminal. Is this possible?

Your input file needs to be in the same directory as the executable if you don't supply a full path to it.

In the left pane of Qt Creator click on "Projects", near the top "Build" should be highlighted, if not click on it. Under "General", if "Shadow build" is checked, you can either uncheck it and the project will be built in your source directory where your input file resides or leave it checked and copy your input file to the build directory.

Again under "Projects", near the top click "Run" then uncheck "Run in terminal"

Edit: Reread your post. Sometimes I wonder about my reading comprehension. If "Run in terminal" is unchecked, the prompt for the file name will show up in the application output tab but Qt Creator won't accept input. So unchecking "Run in terminal" will not work for programs requiring user input.

Great thanks.
One thing: Unchecking run in terminal does run it in the IDE under the editor but I lose user input capability. Is this normal. NP if it is. I can go with the terminal for user input programs.

Yep. See my edit above.

The default terminal emulator is xterm. If you prefer something else you can change it: Tools->Options->Environment->Terminal

I run KDE so I set the terminal emulator to Konsole.