Is there no limit to what simple homework assignments people wants help with here?

If you don't have a clue how to make that program, maybe you should start attending some of the lessons in you class? Start thinking!!! What would you do if you were to read two text files and tell sombody else where they differ?
Would you first ask a stranger to do it for you or would you start comparing letter by letter and when something differs, write it down so you can tell somebody where they differ?