sizeof() confusion

[Larry Jones]

In article <1990Nov14.154213.27324 at cbnewsj.att.com>, asd at cbnewsj.att.com (Adam S. Denton) writes:
> You take sizeof() of an object, not an expression.

Sorry, wrong answer.  sizeof is an operator just like +, %, or -> --
its operand most certainly IS an expression.  sizeof (a * b / c) is
every bit as valid as sizeof a (or sizeof(a) for those who think it's
some kind of magic function rather than an operator).  The key point
(which someone else has already mentioned) is that expressions do not
undergo any conversions simply because they are expressions; rather,
the operands of each operator are converted according to the rules for
the particular operator.  So, although most operators convert an operand
which is an identifier into the corresponding value (i.e. convert an
lvalue into an rvalue), sizeof does not.
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