Am 30.07.2013 18:20, schrieb Mark Morgan Lloyd:
Now specifically to your question - I believe that one of the reasons
may
be the fact that Pascal does not support unary arithmetic operators in
postfix notation. The fact that C allows using them with both prefix and
postfix notation makes them even more difficult from my point of view
because potentially allowing them only in one of the notations known
from
other languages would immediately trigger users to ask why only one of
possible notations (common elsewhere) is supported and the other not.
I've got a vague recollection that some of the ++ and -- semantics are
particularly unpleasant, and that one of the C inventors did his best
to disown them. At least += etc. are fairly unambiguous: they're
almost macro expansions and as such they don't mandate any extra
overloadable operators etc.
FWIW:
the += etc. assignment operators make sense IMO,
because for complex expressions involving array indices etc.
that are to be incremented or decremented, it is no more necessary
to write them twice.
Compared to that, the difference between ++ and += 1
(with ++ you have to put parantheses around the expression to be
incremented !!)
seems unimportant.
And, if that's a matter for you: the newer PL/1 compilers
support += etc., but don't support ++ and --,
Kind regards
Bernd
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