dtang9 wrote:

For HW10P04,  it says display the results in an output file. Do we use Print Writer to display the output onto the same file the user entered? Or do we create another separate output file?

You should write to a new file.  Generally speaking, you don't want to write back to the input file unless you are doing something specialized.  If you write to the input file you will most likely overwrite the input data which is not good.

You may do that if you wish, or you may choose a name internally and just always write to that file.