Re: How to read a line of text?

[Vic Bancroft]

On Thu, 8 Jan 2004, Ron Stodden wrote:

> My statement was that gprolog is missing a not(<predicate>) operator.     
> Pretty
> basic stuff, and easier to type than \+.

Since the negation operator defined in the ISO prolog standard is \+ that 
might be the best reference for the behavior.  Looking back over the mail 
logs, Daniel suggests that the following definition for not/1,

  not(Goal) :-  \+ Goal.

One could use op/3 if using the parens is inconvenient.  What priority are 
you accustomed to having for that operator ?

There were a few folks pulling together some predicates that were handy 
for porting programs from other varients of prolog.  Perhaps that effort 
could be revisited.

more,
l8r,
v

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