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Whether that article addresses rounding up, down or sideways, it's an
awfully long article for what should be a fairly simple thing...
It does seem long-winded toward the top. I guess it's notable that in
all that text, it doesn't even note the floor/ceiling concept. I
interpret the absence as because it's obvious, but you could argue
(given the inanity of the Ask.com answers) that isn't obvious enough
to be left out of the "'pedia of record." Maybe someone on Internals
is also an active Wiki editor.
-- S.