From: kungfu-free <kungfu-free-pub@...>
Date: 2009-04-01T01:10:29+09:00
Subject: Re: Euro currency symbol

ruby -e 'puts "\244"'


David Wright a �crit :
> 7stud -- wrote:
>> 7stud -- wrote:
>>> $ri chr
>>> ------------------------------------------------------------ Integer#chr
>>>      int.chr    => string
>>> ------------------------------------------------------------------------
>>>      Returns a string containing the ASCII character represented by the
>>>      receiver's value.
>>>
>>>         65.chr    #=> "A"
>>>         ?a.chr    #=> "a"
>>>         230.chr   #=> "\346"
>>>
>>>
>>> There is no ascii character with an ascii code equal to 8364.  The pound 
>>> has been around a long time, and it made it into extended ascii (or 
>>> latin-1, which uses 8 bits).  
>> 8 bits can be used to store codes between 0-255.
>>
>> ascii characters are represented by numerical codes between 0-127, so 
>> the text describing the operation of chr in the docs is wrong. 
>> According to the description, you would expect codes above 127 to 
>> produce errors.  But codes between 127-255 do not produce errors.  The 
>> last example demonstrates that.  The docs should read something like:
>>
>> Returns a string containing the latin-1 (or ISO-8859-1) character 
>> represented by the receiver's value.  Valid character codes are 0-255.
> 
> 
> Thanks, good stuff.  I didn't know about Array#pack
> 
> Sure, I'm familiar with character sets, I was assuming the 'same as 
> Perl' chr functionality, I should have checked the rdoc for chr,...
> 
> Perl:
>  chr     Returns the character represented by that NUMBER in the
>                character set.  For example, "chr(65)" is "A" in either 
> ASCII
>                or Unicode, and chr(0x263a) is a Unicode smiley face.
> 
> 
> Ruby:
>      int.chr    => string
> ------------------------------------------------------------------------
>      Returns a string containing the ASCII character represented by the
>      receiver's value.
> 
irb(main):019:0> str = "\244"
=> "\244"
irb(main):020:0> puts str
�
=> nil