The tooltip for the downvote button says
This question does not show any research effort; it is unclear or not useful.
It is an excellent description of the question you link.
Does not show any research effort
The particular example linked looks like a "Do my homework" question, and does not show any evidence of effort beyond a poor transcription.
But in general, Stack Overflow-type questions on this site betray a lack of basic research effort in that it doesn't take much lurking to realise that that isn't what this site is about. If the poster had bothered to look for a FAQ it would have been very clear that they had the wrong site.
In my opinion, the basic netiquette breach of failing to lurk and have a vague idea of what's on topic before you post automatically qualifies as lack of research effort.
It is unclear
Even if the question had been on topic, it would have drawn 5 close votes as unclear very quickly.
It is not useful
Again, leaving aside the fact that it's blatantly not on topic for this site, who would benefit from the question being answered? No-one. Not even the poster, who's supposed to be learning how to program and instead would only learn that there's a sucker born every minute.
When you interpret useful in the context of PPCG, this counts doubly: to be useful on this site, a question should provide an interesting challenge.
Few questions are more deserving of a downvote.
Note that both the tooltip and the summary say question(s), not poster(s). The voting tools are intended to be used on questions. If you worry that people might not be able to differentiate a downvote on their question from a downvote on their personal worth, add a comment, but don't let it stop you voting. We all need to distinguish criticism of our actions/products/outputs from personal criticism, and those who haven't already learnt to do so will benefit from learning earlier rather than later.