0.06 == 0.06 returns false in Ruby?

Hi

I wrote a simple test program, basically the program asks the user to
enter floats. the entered values shall be used as keys for Hash (the
values are irrelavent).

The program tries to find the lowest untaken key/float (floats are used
as keys).

please see attachment.

please run the prog, and enter the following:
0.01 - OK
0.02 - OK
0.03 - OK
0.04 - OK
0.05 - OK
0.06 - Problem

Can anyone explain to me what's going on here?

thanks
jason

Attachments:
http://www.ruby-forum.com/attachment/193/test.rb

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