uucp@occrsh.UUCP (09/25/87)
This has no doubt been discussed before, and I wasn't paying attention :-)
unsigned int xyz = 0x8000 ;
main()
{
printf("xyz=%d\n", xyz) ;
}
...gives me -32768. Really screws things up trying to read files in 32k
chunks.
David Drexler
uucp: ihnp4!occrsh!squid!david +++ SOURCEry System BBS, FidoNet 1:19/0
vox: <405> 720-9630 +++ <405> 728-2463 (2400/1200/300)iverson@cory.Berkeley.EDU (Tim Iverson) (09/26/87)
In article <236@occrsh.ATT.COM> writes: >This has no doubt been discussed before, and I wasn't paying attention :-) > >unsigned int xyz = 0x8000 ; > >main() >{ > printf("xyz=%d\n", xyz) ; >} > >...gives me -32768. Really screws things up trying to read files in 32k >chunks. Well, I've never used tc (and never will), but this isn't a bug. It is perfectly K&R kosher - %d implies *signed* int. If you want an unsigned int, you should use %u. Always check the manual before assuming a compiler bug; even with something as buggy as tc, its more likely to be your fault. - Tim Iverson iverson@cory.Berkeley.EDU ucbvax!cory!iverson
richardh@killer.UUCP (09/27/87)
In article <236@occrsh.ATT.COM>, uucp@occrsh.UUCP writes: > unsigned int xyz = 0x8000 ; > > main() > { > printf("xyz=%d\n", xyz) ; > } > > ...gives me -32768. Really screws things up trying to read files in 32k > chunks. Printf only knows the types of its parameters by looking at the format string. The conversion char %d specifies a signed int. Use %u (or %o or %x) if you want to see the 16-bit value as an unsigned. The bit pattern 0x8000 IS -32768 when interpreted as a signed two's-complement decimal number. richard hargrove ..!inhp4!killer!richardh ------------------------
mac@idacrd.UUCP (Bob McGwier) (09/28/87)
in article <236@occrsh.ATT.COM>, uucp@occrsh.UUCP says: > > This has no doubt been discussed before, and I wasn't paying attention :-) > > unsigned int xyz = 0x8000 ; > > main() > { > printf("xyz=%d\n", xyz) ; > } > > ...gives me -32768. Really screws things up trying to read files in 32k > chunks. I think the problem is yours and not tc. change printf("xyz=%u\n",xyz); You are passing printf a number and telling it that it is a SIGNED integer with the %d. Bob