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comp.lang.ruby

NoMethodError: undefined method `scanf' for main:Object

Alex Shulgin

9/16/2007 8:22:00 AM

Hi,

I'm trying to use scanf(), but no luck:

$ ruby --version
ruby 1.8.6 (2007-06-07 patchlevel 36) [i486-linux]
$ uname -a
Linux zrbite 2.6.21-2-686 #1 SMP Wed Jul 11 03:53:02 UTC 2007 i686 GNU/
Linux
$ irb
irb(main):001:0> w=scanf("%s")
NoMethodError: undefined method `scanf' for main:Object
from (irb):1
irb(main):002:0>

Trying to call $stdin.scanf() does not help either (NoMethodError).
What I'm missing?


Cheers,
Alex
4 Answers

Bil Kleb

9/16/2007 12:05:00 PM

0

Alex Shulgin wrote:
> Hi,

Hi.

> Trying to call $stdin.scanf() does not help either (NoMethodError).
> What I'm missing?

I don't know, but the ri docs sure are sparse for ruby 1.8.6 (2007-03-13):

$ ri scanf
More than one method matched your request. You can refine
your search by asking for information on one of:

IO#block_scanf, IO#scanf, Kernel#scanf, String#block_scanf,
String#scanf

$ ri Kernel.scanf
----------------------------------------------------------- Kernel#scanf
scanf(fs,&b)
------------------------------------------------------------------------
(no description...)

But the original project examples at

http://www.rubyhacker.com/c...

might get you going...

Regards,
--
Bil Kleb
http://nasarb.rub...

dblack

9/16/2007 12:16:00 PM

0

dblack

9/16/2007 12:17:00 PM

0

Alex Shulgin

9/16/2007 12:28:00 PM

0

On Sep 16, 3:15 pm, dbl...@wobblini.net wrote:
>
> > But the original project examples at
>
> >http://www.rubyhacker.com/c...
>
> > might get you going...
>
> That version is obsolete; it's best to use the one that ships with
> Ruby. You have to require it, though -- it's standard library rather
> than core.
>
> require 'scanf'
> p "abc 123".scanf("%s%d") => ["abc", 123]
>
> There's considerable documentation in the source file, but it's not in
> rdoc form. It's on my to-do list....

Thanks -- this resolves my issue. Seems like the docs on scanf are
simply outdated. :-)


Alex