boolean in OCaml

"[email protected] [ocaml_beginners]" <[email protected]> 07 Aug 2014 21:57:14 -0700

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

Hi,
 I defined a boolean variable in a .ml file using OCaml like that:
 let whilecmd = false
 and somewhere I assign true to this boolean variable :
 whilecmd=true;  (It gives a warning : this expression should have type unit)
 and it doesn't work. The boolean whilecmd is still false.
 Can anyone help me?
 

 Thanks

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