I guess he wish to know if only every 4 points of strength you get 1% more damage or you get 0,25% every point. Example. you get 1% at 4 str, 2% at 8 str or you get 1,25 at 5 str.
And for inteligence he wish to know if that xp gets rounded down. means if you should get say 5,7 xp from int, will you get 5 or 6.
Both answers we cant give you now, because those are functions in code, visible only to programmers.