using Prolog  ,,, Implement "is_friend" which makes the "friend" relation a symmetric relation (i.e., if X is friends with Y then Y is friends with X).

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
icon
Related questions
Question

using Prolog  <list , backtracking , recursion> ,,, Implement "is_friend" which makes the "friend" relation a symmetric relation

(i.e., if X is friends with Y then Y is friends with X).


Examples:
?- is_friend(ahmed, samy).
true.
?- is_friend(samy, ahmed).
true.
Note: In the knowledge base, we have only one relation for Ahmed and Samy.


example 2 


Get the list of all friends of a given person.
Examples:
?- friendList(ahmed, L).
L = [samy, fouad].
?- friendList(huda, L).
L = [mariam, aisha, lamia].


example 3 


Get the number of friends of a given person. (For the "count" rule, use tail recursion)
Examples:
?- friendListCount(ahmed, N).
N = 2.
?- friendListCount(huda, N).
N = 3.


example 4  :


Suggest possible friends to a person if they have at least one friend in common (at
least one mutual friend). Make sure that the suggested friend is not already a friend of
the person.
Examples:
?- peopleYouMayKnow(ahmed, X).
X = mohammed;
X = said;

?- peopleYouMayKnow(huda, X).
X = hagar;
X = zainab;
X = hend;
X = zainab;

Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 4 steps

Blurred answer
Knowledge Booster
Transitive relations
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Database System Concepts
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education