#!/usr/local/bin/ruby

class Sample
  def say
    puts 'Hello, world!'
  end
end

sample = Sample.new
sample.say # Hello, world! と表示

puts 'Hello, world!' # Hello, world! と表示

p 1.to_s # "1" と表示
p true.to_s # "true" と表示

p 'hello'.class # String と表示
p String.ancestors # [String, Comparable, Object, Kernel, BasicObject] と表示
p 10.class # Fixnum と表示
p Fixnum.ancestors # [Fixnum, Integer, Numeric, Comparable, Object, Kernel, BasicObject] と表示
p true.class # TrueClass と表示
p TrueClass.ancestors # [TrueClass, Object, Kernel, BasicObject] と表示
p nil.class # NilClass と表示
p NilClass.ancestors # [NilClass, Object, Kernel, BasicObject] と表示

puts 'Hello, world!'

puts 'こんにちは'

# encoding: utf-8
puts 'こんにちは'