Real World Ocaml examples not working

"Roelof Wobben [email protected] [ocaml_beginners]" <[email protected]> Thu, 16 Oct 2014 12:44:15 +0200

Newsgroups	gmane.comp.lang.ocaml.beginners
Message-ID	<[email protected]>

Hello,

I try some examples of the realword Ocaml book but now I see this output :

# let ratio x y = Float.of_int x / Float.of_int y ;;
Error: Unbound module Float
# open Core.std ;;
Error: Syntax error
# open Core.Std ;;
Error: Unbound module Core

How to solve this ?

Roelof

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