i should use
X is sqrt(100).
X = 10.0
yes

sorry to disturb all of you !

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

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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