Best illustrated with an example::
Personally I feel that both of these questions are same "Return Value Of printf()" but still the question asked in Link2 was downvoted and closed as ambiguous and vague. Now what I understand from the question, that too from a new user is pretty clear although the sentence was not framed correctly or the question could have been edited to be more clear.
On the contrary, the question asked in Link1 was encouraged and appreciated with 9 upvotes.
My doubt is how do members( read experts and gurus ) of Stack Overflow decide to appreciate or condemn a question ? And is it only me who wonders about this mystery or is there anybody else too (Of Course, you don't need to provide a solution for this question) ?