precedence lossage

/pre's*-dens los'*j/ A misunderstanding of operator precedence resulting in unintended grouping of arithmetic orlogical operators when coding an expression. Usedespecially of mistakes in C code due to the nonintuitivelylow precedence of "&", "|", "^", "<>". For example,the following C expression, intended to test the leastsignificant bit of x,

x & 1 == 0

is parsed as

x & (1 == 0)

which is always zero (false).

Some lazy programmers ignore precedence and parenthesiseeverything. Lisp fans enjoy pointing out that this can'thappen in *their* favourite language, which eschews precedenceentirely, requiring one to use explicit parentheseseverywhere.

单词	precedence lossage
释义	precedence lossage precedence lossage /pre's-dens los'j/ A misunderstanding of operator precedence resulting in unintended grouping of arithmetic orlogical operators when coding an expression. Usedespecially of mistakes in C code due to the nonintuitivelylow precedence of "&", "\|", "^", "<>". For example,the following C expression, intended to test the leastsignificant bit of x, x & 1 == 0 is parsed as x & (1 == 0) which is always zero (false). Some lazy programmers ignore precedence and parenthesiseeverything. Lisp fans enjoy pointing out that this can'thappen in their favourite language, which eschews precedenceentirely, requiring one to use explicit parentheseseverywhere.
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