Need help!

Hello everyone, I need to make a program for school, but I'm just without ideas, I'm trying now for over a week to figure out how to do it, but I just can't so I decided to post here, if any of you may know.

This is what I need to do:

Make a program, that will open a text document(.txt) which is on you computer, and will change low case letters into upper case letters, and the opposite as well(upper case letters into low case letters), and then saves the document.

File opening and reading: http://cplusplus.com/reference/iostream/fstream/
Functions to chage case of letters: http://cplusplus.com/reference/clibrary/cctype/
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