English Computing Dictionary
◊ OFF-BY-ONE ERROR
off-by-one error
An exceedingly common error induced in many
ways, such as by starting at zero when you should have started
at one or vice-versa, or by writing "< N" instead of "<◦ N" or
vice-versa. Often confounded with {fencepost error}, which is
properly a particular subtype of it.
[{Jargon File}]
(1998-09-21)