Ruby » Ruby 1.8

Bug #1566

Updated by naruse (Yui NARUSE) over 11 years ago

=begin 
  
  sprintf/String#% use the %e and %E format specifier to determine the case of results which are NaN or Inf. For example: 
 
    $ ruby1.8 -ve 'p sprintf("%e", 0.0/0)' 
    ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux] 
    "nan" 
 
    $ ruby1.8 -ve 'p sprintf("%E", 0.0/0)' 
    ruby 1.8.7 (2008-08-11 patchlevel 72) [i486-linux] 
    "NAN" 
 
  I suspect this is wrong for the following reasons: 
 
  * 1.9 doesn't capitalise these values, i.e. it always returns Inf or NaN. 
  * The rdoc description for the %E field is "Equivalent to `e', but uses an uppercase E to indicate the exponent." Neither Inf or NaN are exponents. 
  * The description for the %e field doesn't make any mention of it's output case. 
  * JRuby, and I believe Rubinius, behave as 1.9 does. 
  * NaN and Inf have specific mathematical meanings; it doesn't make sense to subject them to English capitalisation rules. 
 
 =end 
 

Back