够 or 夠 both mean be enough according to my electronic dictionaries. I was surprised to find one character in my text "Reading & Writing Chinese," (McNaughton & Li, 1999) and a different character in my electronic dictionary (夠).
My first thought was:
Does this happen with other characters or is this an error?
Then I tried typing gou into a different program on the same computer and came up with the second character (having the same meaning).
Which is right? Are there other characters with this behavior?