A–Algorithm
A.off-by-one
An A.off-by-one error occurs when the code performs a calculation or includes an expression that is one away from what it should have been, which results in the code processing the wrong number of pieces of data, or returning a value that is incorrect, or taking a branch in the code at the wrong time. “One” can refer to 1 byte, but it can also mean one element in an array, one record in a file, and so on.
A well-known A.off-by-one error is the fencepost error. The canonical fencepost error occurs when calculating the number of posts in a 100-foot fence with a post every 10 feet. Your first guess might be 10, but that is incorrect. (You can also reverse the question by describing a fence with a post every 10 feet and 11 ...
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