Which of the following adds a method to the Fixnum class that returns the number

Question

Which of the following adds a method to the Fixnum class that returns the number of digits in a Fixnum object? A minus sign does not count as a digit.

class Fixnum
   def num_digits
      return self.abs.length
   end
end

class Fixnum
   def num_digits
      return self.abs.to_s.length
   end
end

class Fixnum
   def num_digits
      return self.length.abs.to_s
   end
end

class Fixnum
   def num_digits
      return self.to_s.length
   end
end

class Fixnum
   def num_digits
      return self.abs.length
   end
end

class Fixnum
   def num_digits
      return self.abs.to_s.length
   end
end

class Fixnum
   def num_digits
      return self.length.abs.to_s
   end
end

class Fixnum
   def num_digits
      return self.to_s.length
   end
end

Explanation / Answer

class Fixnum
   def num_digits
      return self.abs.to_s.length
   end
end

This method is uaed to add required return statement to fixnum class.

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