Re-using rolls and negative numbers

I'm using a lot of useful tips here on the forum and I came across this: In my RPG game, the enemy's defense can be higher than the attack, and when this happens the damage dealt is equal to 1. However, I don't know how to show this in a roll. It is possible? round a number using this function $[[0]]? Anyone who can help with this issue will solve all my problems. LOL

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