Best Prolog Books to Buy in October 2025

Learn Prolog Now! (Texts in Computing, Vol. 7)
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PROLOG: Obstetrics, Ninth Edition (Assessment & Critique)



PROLOG: Patient Management in the Office, Eighth Edition



Programming in Prolog: Using The Iso Standard
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Clause and Effect: Prolog Programming for the Working Programmer
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PROLOG: Gynecologic Oncology and Critical Care, Eighth Edition (Assessment & Critique)


In Prolog, you can split a list into two parts by using the built-in predicate append/3
along with the length/2
and append/2
predicates.
First, use the length/2
predicate to determine the length of the first part of the list. Then, use the append/3
predicate to split the list into two parts based on the determined length. Finally, you can use the append/2
predicate to concatenate the two parts back into a single list.
This process effectively splits the original list into two separate lists.
How to split a list into two in Prolog?
To split a list into two in Prolog, you can use the following predicate:
split_list([], [], []). split_list([X], [X], []). split_list([X,Y|T], [X|T1], [Y|T2]) :- split_list(T, T1, T2).
Here is an example of how to use this predicate:
split_list([1,2,3,4,5,6], L1, L2).
This will split the list [1,2,3,4,5,6]
into two lists L1 = [1,3,5]
and L2 = [2,4,6]
.
How to extract elements from a list based on a condition in Prolog?
To extract elements from a list based on a condition in Prolog, you can use the built-in predicates such as findall/3
or bagof/3
. Here is an example using findall/3
:
% Define a predicate to filter elements based on a condition filter_list([], _, []). filter_list([X|Xs], Condition, [X|Ys]) :- call(Condition, X), filter_list(Xs, Condition, Ys). filter_list([_|Xs], Condition, Ys) :- filter_list(Xs, Condition, Ys).
% Example predicate to filter even numbers is_even(X) :- 0 is X mod 2.
% Usage: Filter even numbers from a list filter_even_numbers(InputList, OutputList) :- filter_list(InputList, is_even, OutputList).
% Example query: % ?- filter_even_numbers([1,2,3,4,5,6], Result). % Result = [2, 4, 6].
In this example, filter_list/3
predicate recursively filters elements from the input list based on the specified condition (in this case, the is_even/1
predicate) and returns the output list. Finally, the filter_even_numbers/2
predicate can be used to filter even numbers from a list.
You can modify the condition predicate (is_even/1
in this example) to filter elements based on different conditions.
How to divide a list into alternating elements in Prolog?
You can divide a list into alternating elements in Prolog by writing a predicate that takes a list as input and returns two lists, one containing the elements at even positions and the other containing elements at odd positions. Here is an example predicate that achieves this:
split_alternating([], [], []). split_alternating([X], [X], []). split_alternating([X, Y | Rest], [X | Odds], [Y | Evens]) :- split_alternating(Rest, Odds, Evens).
You can use this predicate by calling split_alternating/3
with a list and two empty lists as arguments. For example:
?- split_alternating([1, 2, 3, 4, 5, 6], Odds, Evens). Odds = [1, 3, 5], Evens = [2, 4, 6].