<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8"> <META NAME="GENERATOR" CONTENT="GtkHTML/3.12.3"> </HEAD> <BODY> On Wed, 2007-05-23 at 18:45 -0500, Michael Hennebry wrote: <BLOCKQUOTE TYPE=CITE> <PRE> On Wed, 23 May 2007, Mike McCarty wrote: > Michael Hennebry wrote: > > On Wed, 23 May 2007, George Arseneault wrote: > > > > > >>Now the bad news... C, C++, gnu, several variations on > >>the ISO; not to mention all the libraries, etc. And, > >>to top it off, some of the stuff in the book just > >>doesn't work. (A program to demonstrate the various > >>types of integer variables and how to display them > >>with printf(), failed to show any difference with any > >>arguments I could find.) > > > > > > Should they have produced different results? > > On big-endian machines, they can. For example, with two's complement > arithmetic on a big-endian machine, > > printf("%d\n",-2); > > does not result in > > -2 It should. printf, declared or not, will look for an int and get it. printf("%u\n", -2); is more interesting. We might be in the domain of nasal demons. printf("%u\n", (unsigned)-2); Is legal, but rather obviously will not print "-2\n". It will probably print something even regardless of endianness. > > Printing (int)sizeof(typename) will distinguish some types. > > Note that short, int and long usually only have two distinct sizes. > > It's allowed, but rare, for all the arithmetic types to have size 1. > > Note that what you suggest works because sizeof(.) for integer > types is going to be a small number. The only portable means For small read <=16. > of displaying an unsigned integer of unknown size is > > printf("Thing = %ul\n",(unsigned long int)Thing); > > For "rare" read "no known implementation". Since long int > is required to be at least 32 bits, that would require > that char be at least 32 bits. And double has to be more. My recollection is that there was a Cray compiler that had 64-bit chars. Anyone know for sure? -- Mike <A HREF="mailto:hennebry@web.cs.ndsu.NoDak.edu">hennebry@web.cs.ndsu.NoDak.edu</A> "Horse guts never lie." -- Cherek Bear-Shoulders </PRE> </BLOCKQUOTE> sizeof generally returns size in bytes or words (depending on how the implementer read the spec) I have never seen it return words. And the Cray stored 8 characters in 64 bits using ASCII coding a LONG time ago. I had forgotten about that. I think that was the model where you sat on the processing unit when you were at the console. Regards, Les H </BODY> </HTML>