polynomial calculations over Z/Zp (for prime p)?

[Alberto Candel]

I wonder if one has a choice of residue system used. The %% uses the minimal residue system mod n. Is there a way to display results using the common (or least) residue system mod n (that is, {0,1,...,n-1})? The negative signs combined with the double %% make the results rather cumbersome to read.