It means they can't succeed in writing the code. It's not a failure to understand how to use the IDE, or a failure to understand how to compile. It's that the

It means they can't succeed in writing the code. It's not a failure to understand how to use the IDE, or a failure to understand how to compile. It's that the applicant cannot actually write even the most basic code. The fact that this is so hard to believe and yet happens so often is what makes FizzBuzz so interesting.