Actually, the "best" way to round a number may be as follows:
perl -E "my $num=\"33\"; say \"$num\".'0';"
There appears to be some general agreement that any multiple of ten is a "round" number. If that's not a broad enough concensus, try concatenating 2, 3, 4 or 5 zeros.
This solution is scarcely more fatuous than your suggestion that the best way to round a number is "the logic on the sample code...."
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