Can't access class of a loaded file in the IRB

I have two Ruby files. I am able to access the class of one of the files
but not the other. Here are my two files:

bankaccount.rb:

# http://www.techotopia.com/index.php/Ruby_Object_Oriented_Programming

class BankAccount
   def initialize ()
   end

   def test_method
        puts "The class is working"
   end
end


complex.rb:

class ComplexNumber
  def initialize()
  end
  def a
    @a = 0
  end
  def b
    @b = 0
  end
end


I can create a BankAccount object just fine in the IRB, but when I try
to create a ComplexNumber object I get an error saying "unitialized
constant" even though I entered 'load "complex.rb"' and 'load
"bankaccount.rb"'.

irb(main):008:0> a = BankAccount.new()
=> #<BankAccount:0x2b0fc50>
irb(main):009:0> b = ComplexNumber.new()
NameError: uninitialized constant ComplexNumber
        from (irb):9
        from C:/Ruby193/bin/irb:12:in `<main>'

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