Messages in this thread | | | Date | Thu, 22 Nov 2001 07:03:28 -0500 (EST) | From | Alexander Viro <> | Subject | Re: [BUG] Bad #define, nonportable C, missing {} |
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On Thu, 22 Nov 2001, Horst von Brand wrote:
> Stevie O <stevie@qrpff.net> said:
> > But x++ is postincrement though. That means the value of 'x' is inserted, > > and after the expression is evaluated, x is incremented. Right? > > Nope. x++ increments x sometime (not defined when) after taking the value. > > x = x++ % y > > is wrong: There is just one sequence point at the end of the expression, > and x is modified twice in between (++ and =).
Or look at it that way: both tmp = x % y; x++; x = tmp; and tmp = x % y; x = tmp; x++; are possible interpretations with different results. And as usual, compiler is allowed to do literally anything whenever it sees such beast.
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