why cannot i use sqrt ?

z_axis <[email protected]> Tue, 08 Jan 2013 15:59:28 +0800

Newsgroups	gmane.comp.gnu.prolog.general
Organization	zsoft
Message-ID	<[email protected]>

GNU Prolog 1.4.2
By Daniel Diaz
Copyright (C) 1999-2012 Daniel Diaz
| ?- sqrt(100).
uncaught exception: error(existence_error(procedure,sqrt/1),top_level/0)
| ?-

Sincerely!

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