[Haskell-cafe] Haskell code for this example of flow control

[Maurício]

  Hi,

  I would like to know what options I have in Haskell to do something 
similar to this C++ code:

double a = 1000;
while (a>1) a/=2;

  I'm able to do that with lists, but I would like to know how to do 
that with monads and variables with state.

  Thanks,
  Maurício

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