title: What class is "EXIT_FAILURE"?
body: <p>In the main function, I had a lot of error testing code to make sure I successfully located and opened some files. So since I did that a lot, I made it a separate, void, function. When I previously had "return EXIT_FAILURE" in the main function it would work just like I wanted it to. But when I put it in a secondary function I named errorTest, it gets on me about returning something after declaring it a void function. So, what class is "EXIT_FAILURE", so I can differently declare that void function into returning whatever class "EXIT_FAILURE" is?</p>
  
  <p>(and yes, I included the library cstdlib)</p>