It may seem silly to have a section checking for the end of a file (EOF), but there are a plethora of methods employed by programmers, and improperly checking for the EOF can absolutely cripple performance and introduce mysterious errors and exceptions to your application.-It may seem silly to have a section on checking for the end of a file (EOF), but there are a plethora of methods employed by programmers, and improperly checking for the EOF can absolutely cripple performance and introduce mysterious errors and exceptions to your application.