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class Person
 
  def initialize( name,age=18 )
    @name = name
    @age = age
    @motherland = "China"
  end
 
  def talk
    puts "my name is "+@name+", age is "+@age.to_s
 &n ......

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irb µÄÃüÁîÐÐÑ¡Ïժ×Ô¡¡Porgramming Ruby µÚ¶þ°æ£©
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-m
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include Math
puts sqrt(91);
module Me
  def sqrt(a)
  puts a*a;
  return a*a;
end
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