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precedence lossage

precedence lossage in Technology

/pre's*-dens los'*j/ A misunderstanding of operator precedence resulting in unintended grouping of arithmetic or logical operators when coding an expression. Used especially of mistakes in C code due to the nonintuitively low precedence of "&", "|", "^", ">". For example, the following C expression, intended to test the least significant bit of x,
x & 1 == 0
is parsed as
x & (1 == 0)
which is always zero (false).
Some lazy programmers ignore precedence and parenthesise everything. Lisp fans enjoy pointing out that this can't happen in *their* favourite language, which eschews precedence entirely, requiring one to use explicit parentheses everywhere.
[Jargon File]
The Free On-line Dictionary of Computing, © Denis Howe 2010
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