>>715442589
The context is that certain actions occur while holding the button which may enable you to get a star, such as spinning slower in the air allowing you to get more distance or swimming fast. In the case of a half a press, you would round the number up if you were doing a single star a press challenge, but in the context of a 120 star run, you could leech that a press off of a previous one because the action required doesn't require a press but only a hold. Therefore you would round down. Any particular star that can be gotten in "0.5" a presses means that in isolation it would be "1" while in a full run it would be "0"
It's not a difficult concept
Educate yourself