From: "QUEISSER,ANDREW (HP-Corvallis,ex1)" <andrew_queisser@...>
Date: 2002-03-30T08:53:41+09:00
Subject: RE: Decimal->Hex

try 

blahblah = sprintf("%x", blah)

sprintf actually returns the string, it doesn't write into it.
Your example tries to use blahblah as the format string and
"%x" and blah as the arguments.

> -----Original Message-----
> From: Jason DiCioccio [mailto:geniusj@bluenugget.net]
> Sent: Friday, March 29, 2002 3:43 PM
> To: ruby-talk@ruby-lang.org
> Subject: RE: Decimal->Hex
> 
> 
> irb(main):001:0> blah = 15
> 15
> irb(main):002:0> blahblah = ""
> ""
> irb(main):003:0> printf("%X", blah)
> Fnil
> 
> (looks good so far . . .)
> 
> irb(main):004:0> sprintf(blahblah, "%X", blah)
> ""
> irb(main):005:0> blahblah
> ""
> 
> I had tried this earlier actually with the same results (forgot to
> mention it).. I might be doing something wrong this time as well.
> Am I missing something simple? :)
> 
> It seems to work in C though:
> 
> ----
> #include <stdio.h>
> 
> int
> main( void )
> {
>   int blah = 15;
>   char blahblah[8];
> 
>   printf("printf: %X\r\n", blah);
>   sprintf(blahblah, "%X", blah);
>   printf("after sprintf: %s\r\n", blahblah);
> 
>   return( 0 );
> }
> ----
> 
> FYI, ruby 1.6.7 (2002-03-01) [i386-freebsd4]
> 
> Thanks again,
> -JD-
> 
> --On Saturday, March 30, 2002 8:28 AM +0900 "QUEISSER,ANDREW 
> (HP-Corvallis,ex1)" <andrew_queisser@hp.com> wrote:
> 
> > You can use sprintf, just like in the good old C days
> > but in Ruby sprintf returns a string.
> >
> > Andrew
> >
> >
> >> -----Original Message-----
> >> From: DiCioccio, Jason [mailto:jdicioccio@epylon.com]
> >> Sent: Friday, March 29, 2002 2:51 PM
> >> To: ruby-talk@ruby-lang.org
> >> Subject: Decimal->Hex
> >>
> >>
> >>
> >> -----BEGIN PGP SIGNED MESSAGE-----
> >> Hash: SHA1
> >>
> >> I have a feeling I might be missing something very simple
> >> here.  But I found
> >> a method to convert a string representing a hexadecimal value
> >> into a Fixnum
> >> (String#hex).  Is there a way to convert it back now?
> >>
> >> Thanks in advance,
> >> - -JD-
> >>
> >> -----BEGIN PGP SIGNATURE-----
> >> Version: PGP 7.0.4
> >>
> >> iQA/AwUBPKTx/b8+wXo6G32BEQJXpwCfcBbLelw6YnmK6K3Vj4+U9SrIf4kAniTQ
> >> aMuPsAT8EmEu1FxjG1NRdiFj
> >> =iqTS
> >> -----END PGP SIGNATURE-----
> >>
> 
>