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| NNTP-Posting-Date | Thu, 19 May 2011 15:21:34 -0500 |
| From | Pete Becker <pete@versatilecoding.com> |
| Organization | Roundhouse Consulting, Ltd. |
| Newsgroups | comp.lang.c++ |
| Date | Thu, 19 May 2011 16:21:34 -0400 |
| Message-ID | <2011051916213466006-pete@versatilecodingcom> (permalink) |
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| Subject | Re: '5'-'0' = 5 alway? guaranteed? |
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On 2011-05-19 15:58:29 -0400, Noah Roberts said: > On 5/19/2011 12:35 PM, crea wrote: >> "Alf P. Steinbach /Usenet"<alf.p.steinbach+usenet@gmail.com> wrote in >> message news:ir3qlq$a84$1@dont-email.me... >>> * crea, on 19.05.2011 21:13: >>>> I am just programming this kind of thing, and was wondering I according >>>> to >>>> c++ language it is always guaranteed that >>>> '5'-'0' = 5. Character calculations. Because character should be in order >>>> isnt it? Is it guaranteed that they are in order and the difference is 1? >>> >>> Yes. >>> >>> But that does not hold for letters (which are discontiguous in EBCDIC, >>> which the C++ standard "must" support). >>> >> >> ok, good to know also the letter-thing. >> >> > > He's wrong actually. It's a really good bet, but by no means guaranteed. The character representations of the digits 0-9 are required to be contiguous and in ascending order. And there's no similar requirement for any other characters. -- Pete Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The Standard C++ Library Extensions: a Tutorial and Reference (www.petebecker.com/tr1book)
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'5'-'0' = 5 alway? guaranteed? "crea" <no@invalid.com> - 2011-05-19 20:13 +0100
Re: '5'-'0' = 5 alway? guaranteed? "Alf P. Steinbach /Usenet" <alf.p.steinbach+usenet@gmail.com> - 2011-05-19 21:28 +0200
Re: '5'-'0' = 5 alway? guaranteed? "crea" <no@invalid.com> - 2011-05-19 20:35 +0100
Re: '5'-'0' = 5 alway? guaranteed? Noah Roberts <dont@email.me> - 2011-05-19 12:58 -0700
Re: '5'-'0' = 5 alway? guaranteed? Victor Bazarov <v.bazarov@comcast.invalid> - 2011-05-19 16:10 -0400
Re: '5'-'0' = 5 alway? guaranteed? Pete Becker <pete@versatilecoding.com> - 2011-05-19 16:21 -0400
Re: '5'-'0' = 5 alway? guaranteed? "crea" <no@invalid.com> - 2011-05-19 21:24 +0100
Re: '5'-'0' = 5 alway? guaranteed? "Alf P. Steinbach /Usenet" <alf.p.steinbach+usenet@gmail.com> - 2011-05-20 00:39 +0200
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