is it directnumber including 0

Yes. Because:
direct number is number that have a positive sign (+) or a negative sign (-)
so if your answer is +0 / -0, it is correct
but if your answer is 0, it is not.

Hope I can help you ^_^

but if only u write a ''2'' dnt have positive sign , is it a direct number ?

2014-09-25 19:00:39 補充：
and i cant see ur website

It actually depends that if that number is a +0 or a -0.
if you just write 0, its basically nothing, so its a no.
But if it is a +0 or a -0 then it is.
Reason: Directed numbers have a sign before it like +/- (Plus or Minus)
There is Positive integer (With a plus sign) and negative integer (With a negative Sign)

Hope this can help you :)

2014-09-25 19:43:37 補充：
Only Directed Numbers have a plus or minus sign,
also my reference is my year 6 textbook

Hello Gary,

Yes, if you consider +0 or -0. They are valid, although both are just 0.

http://mathforum.org/library/drmath/view/57215.html