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**************************************************************************
**************API£¨1.8.6£©ÖеÄÀý×Ó: example.rb**********************
  require 'optparse'
  require 'optparse/time'
  require 'ostruct'
  require 'pp'
  class OptparseExample
    CODES = %w[iso-2022-jp shift_jis euc-jp utf8 binary]
    CODE_ALIASES = { "jis" => "iso-2022-jp", "sjis" => "shift_jis" }
    #
    # Return a structure describing the options.
    #
    def self.parse(args)
      # The options specified on the command line will be collected in *options*.     ÃüÁîÐеÄÑ¡ÏîÔÚoptions½á¹¹ÌåÖÐ
      # We set default values here.
      options = OpenStruct.new
      options.library = []
      options.inplace = false
      options.encoding = "utf8"
      options.transfer_type = :auto
      options.verbose = false
      opts = OptionParser.new do |opts|
        opts.banner = "Usage: example.rb [options]"
        opts.separator ""
        opts.separator "Specific options:"
        # Mandatory argument.
        opts.on("-r", "


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arr=[3,4,5,6,7,8,9]
puts arr[0] #3
puts arr.first #3
puts arr[arr.length-1] #9
puts arr[arr.size-1] #9
puts arr.last #9
puts arr[-1] #9
puts arr[-2] #8
print arr[1..3] ,"\n" #456
print arr[-3,4] ,"\n" #789£¬´Ó-3¿ªÊ¼ £¬´òÓ¡4¸öÔªËØ£¬ÕâÀïÖ»ÓÐÈý¸ö
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include Math
puts sqrt(91);
module Me
  def sqrt(a)
  puts a*a;
  return a*a;
end
PI=3.1415926 ......

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