I am creating a quiz in powerapps wherein for every score there is a comment viz if the total score is 10 it will be poor, for 20 it will be Okay, like wise. The issue is that everything is working fine but for total score zero. When all answers are wrong instead of it taking it as zero and comment being Very Poor it is showing blank. The formula is as mentioned below. Score is the variable:
Works perfectly fine for me as is - took your code, pasted it into text label.
Added a slider, set it to update Score var on change - 0 results in "poor" on text label - so in practice the logic is sound.
The only thing I can think of in your situation is that Score somehow has not yet been actually set when you get this result?
This can happen if Score is only set based on a function in the app, and it's never actually setby that function, then it will be Blank() until it is Set.
For example, let's say you only Set the score when someone gets something right, but don't do anything when someone gets it's wrong - then you can end up in a situation where if someone got everything wrong, then Score will never be set.
If this is happening, then the best way to avoid it is to Set(Score, 0) before the quiz starts to make sure it has a value.