multiply 2 number

[nn987]

how to proced with the empty lists in this case?

%Multiply elements of one list

multLista([],1).
multLista([E|T],R):-multLista(T,Multiplica),R is Multiplica*E.
~

ex:
multLista([1,2,3,4],R).
R=24

multLista([],1).
R= 1 !!!!

Thanks

 

[4tangent]

Hi there
Which type of prolog are you using?
Regards
John

 

[nn987]

I use this version of prolog

SWI-Prolog version 5.4.7 by Jan Wielemaker (jan@swi-prolog.org)

 

[4tangent]

OK thank you.I don't see what your problem is ; perhaps I am missing something.
You have a fact that says

multLista([],1).

then you ask

multLista([],R) ?

and it says R = 1.

Why is that a surprise?

Regards

John

 

[MstrOfPppts]

Maybe you wish to say that:
% multLista of empty list is 0
multLista([],0).

But than you have to add another edge case so your recursion would work:
multLista([A],A).