[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Unix/Java design issues (Was: Re: Is CDATA "structure"?)
Nik O scripsit: > I understand Java's intent re the *byte* type, and i agree that Java's use > of Unicode is a long-overdue move to non-Anglo-centric computing. However, > since i've been writing rock-solid C code for almost 20 years, i've long > observed a common programmer laziness concerning all numeric types -- namely > the non-use of the "unsigned" qualifier for inherently unsigned numbers > (e.g. file offsets, binary file contents). The former example created an > unnecessary 32KB (and later 2GB) limit to file sizes handled using the > standard C library. The latter example is still an issue today -- at least > for those whose computing environment includes low-resource embedded systems > and/or legacy byte-oriented data formats. The trouble is that although you can squeeze out a bit with unsigned numbers, you can get hosed very easily in other ways. (BTW, the 15-bit limit on file sizes was gone well before the 6th Edition of Unix.) Furthermore, if 31 bits isn't enough, is 32 bits really so much better? The basic problem is code like this: unsigned count; while (--count > 0) { /* do something */ } This loop will never fail, because unsigned numbers are always greater than or equal to zero. Our intuitions are about mathemtical integers; machine signed ints already have overflow problems that make them deviate from what we expect; adding unsigned behavior (overflowing below zero as well as at MAXINT) makes such values even less intuitive. -- John Cowan cowan@c... I am a member of a civilization. --David Brin xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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