Re: [PLUG] printf and unsigned long

[<Paul.L.Snyder@gsk.com>]

Try using  %lu as your format, rather than %ld.

%u is the conversion specifier for unsigned decimal.  %d is a conversion
specifier for signed decimal.

Paul

------------------------------
Paul L. Snyder
SCS Technology Office - Emerging Technology
GlaxoSmithKline


    From: plug-admin
    Sent: 12/06/2003 11:41 AM
    To: PLUG <plug@lists.phillylinux.org>
    Subject: [PLUG] printf and unsigned long


What am I doing wrong here?

  /*  int.c  */
  #include <stdio.h>

  int
  main(int argc,
       char *argv[])
  {
   signed long SL;
   unsigned long UL, UL2;

   SL = -1;
   UL = (unsigned long)SL;
   printf("SL=%ld, UL=%ld\n", SL, UL);

   UL2 = ~0;
   printf("SL=%ld, UL=%ld\n", SL, UL);

   return 0;
  }

Compiling and running,

  jeff@asterix:int-cast $ gcc -Wall int.c -o int && ./int
  SL=-1, UL=-1
  SL=-1, UL=-1
  jeff@asterix:int-cast $

I would expect at least the second line to show UL equal to a very
large integer, certainly something non-negative.

--
 Jeff

 Jeff Abrahamson  <http://www.purple.com/jeff/>
  GPG fingerprint: 1A1A BA95 D082 A558 A276  63C6 16BF 8C4C 0D1D AE4B




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