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Article View: comp.std.c
Article #796

Re: Floating preprocessing numbers

#796
From: Norman Diamond
Date: Fri, 20 Oct 1989 06:24
29 lines
1812 bytes
I just wrote:

>In section 3.1.8, a preprocessing number does not acquire a type or a
>value until conversion in translation phase 7.  I think there is an
>omission.  A value, and surely a type, must be acquired when an #if
>directive is examined during preprocessing.

>So the question is, why can't a preprocessing number look like this?
>    123.45e67
>In any other context, e.g. an actual floating constant token in phase 7
>which did not derive from a preprocessing number, this is acceptable.
>The "e" does not have to be followed by a sign.  Why, for #if, must the
>"e" be followed by a sign?  (And are there any other situations with
>the same requirement?)

and then noticed that "pp-number nondigit" allows this in an obscure,
reader-unfriendly manner.

Just to get its kicks in, "rn" says:
    End of article 1733 (of 1733)--what next? [npq] C
    You can't cancel someone else's article
and what about my own article, "rn"?  At least now my foot is in your
mouth instead of my own.

-- 
Norman Diamond, Sony Corp. (diamond%ws.sony.junet@uunet.uu.net seems to work)
  Should the preceding opinions be caught or     |  James Bond asked his
  killed, the sender will disavow all knowledge  |  ATT rep for a source
  of their activities or whereabouts.            |  licence to "kill".
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!uakari.primate.wisc.edu!ginosko!uunet!kddlab!titcca!sragwa!wsgw!socslgw!diamond
From: diamond@csl.sony.co.jp (Norman Diamond)
Newsgroups: comp.std.c
Subject: Re: Floating preprocessing numbers
Message-ID: <10978@riks.csl.sony.co.jp>
Date: 20 Oct 89 06:24:26 GMT
References: <10976@riks.csl.sony.co.jp>
Reply-To: diamond@riks. (Norman Diamond)
Organization: Sony Computer Science Laboratory Inc., Tokyo, Japan
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