From 421809929087475748 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,36a60df62b48e6f4,start X-Google-Attributes: gidf78e5,public X-Google-ArrivalTime: 2002-01-11 12:45:01 PST Return-Path: X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!comp-std-cpp-robomod!not-for-mail X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-Server-Uuid: 95b8ca9b-fe4b-44f7-8977-a6cb2d3025ff From: "K. Noel Belcourt" Newsgroups: comp.std.c++ Subject: clause 2.9 Preprocessing numbers [lex.ppnumber] Organization: Sandia National Labs Message-ID: <3C3F4ACF.EF2E6DA2@sandia.gov> MIME-Version: 1.0 X-Trace: sass2141.sandia.gov 1010780799 16808 134.253.161.66 (11 Jan 2002 20:26:39 GMT) X-Complaints-To: usenet@sass2141.sandia.gov NNTP-Posting-Date: Fri, 11 Jan 2002 20:26:39 +0000 (UTC) X-Accept-Language: en X-Filter-Version: 1.8 (sass165) X-WSS-ID: 102195455831282-01-01 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Approved: Fergus Henderson , moderator of comp.std.c++ Date: Fri, 11 Jan 2002 14:42:58 CST Lines: 32 Xref: archiver1.google.com comp.std.c++:8988 I'm a bit confused about production pp-number. Why can a pp-number accept a nondigit following a digit? I understand integral and floating literals well enough, but where would a token of this type be used? pp-number : ... pp-number nondigit This implies that 123_ABC is a valid preprocesing number? [attempting to ask and answer my own question] Per clause 2.9.2, if a macro doesn't replace _ABC with something that permits the translation phase (7) to convert it to a valid integral or floating literal, then it's an error? Is this correct? Thanks, Noel Belcourt --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.research.att.com/~austern/csc/faq.html ]