Re: why cannot i use sqrt ?

[z_axis]

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 <address@hidden> 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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