From: dblack@...
Date: 2007-09-16T21:15:51+09:00
Subject: Re: NoMethodError: undefined method `scanf' for main:Object

Hi --

On Sun, 16 Sep 2007, Bil Kleb wrote:

> 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/code/scanf/
>
> 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That version is obsolete; it's best to use the one that ships with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....


David

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