James Gale <euphoriahardho...@yahoo.co.uk> writes: > Hi I'm a newbee to prolog, and have just installed gnu prolog but what every > I enter into the console I get this error, uncaught exception: > error(existence_error(procedure,even/1),top_level/0) > > example. > > GNU Prolog 1.3.1 > By Daniel Diaz > Copyright (C) 1999-2009 Daniel Diaz > | ?- even(X). > uncaught exception: error(existence_error(procedure,even/1),top_level/0)
I'm a bit rusty, and only just installed gprolog myself, and am not familiar with its messages. But it looks to me like there is no predicate 'even/1' defined -- "existence_error(procedure,even/1). Try something like reverse([1,2,3],X). If that doesn't work, you have an installation error. > > not sure if the installation was wrong, but got not errors or I'm missing > something very simple. > also is there a good FAQ's page for this interpreter. Google "gprolog tutorial" I get lots of hits. I think you need a tutorial rather than a FAQ. Work through some of these. > > many thanks > > James. > > ps. sorry if this is a silly posting but didn't know what else to try :S Good luck. This looks like a low traffic list, so I thought I'd go ahead and answer instead of waiting for a expert. John Velman _______________________________________________ Users-prolog mailing list Users-prolog@gnu.org http://lists.gnu.org/mailman/listinfo/users-prolog
