Newbie question

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2 total messages Started by Guy Cohen Sat, 25 Mar 2000 00:00

#4316

Author: Guy Cohen
Date: Sat, 25 Mar 2000 00:00

8 lines
854 bytes

Hi there
I want to declare "notin"
Lets say I have a list L1
and a X that is not in the list
notin will say "yes"

TIA
A Newbie Guy

Re: Newbie question

#4317

Author: Alex MacAskill
Date: Sat, 25 Mar 2000 00:00

28 lines
1211 bytes

Guy Cohen wrote:
> 
> Hi there
> I want to declare "notin"
> Lets say I have a list L1
> and a X that is not in the list
> notin will say "yes"
> 
> TIA
> A Newbie Guy

This is very simple if you look at 
member/2

member(X,L1) takes X which is a single
element, and L1 is a list.
It returns yes if X is in the list
and no if not.

so for your problem you could use

notin(X,L1) :- not member(X,L1).

Which will return yes if X is NOT
in the list.

Alex

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