how to do this in prolog niece, aunt, relative?

[nesfrank]

I justed started prolog and wanted some help on doing the following:

Express the following relations and queries in Prolog:
niece(X,Y): X is a niece of Y.
aunt(X,Y): X is an aunt of Y.
relative(X,Y): X and Y are relatives.
Who are joe's children?
How many children does joe have?
Are joe and steph relatives?
Please advice?

thanks
Frank

 

[joel76]

You should have facts.
Give your facts.

 

[nesfrank]

Joel, the professor gave only that:


Express the following relations and queries in Prolog:
niece(X,Y): X is a niece of Y.
aunt(X,Y): X is an aunt of Y.
relative(X,Y): X and Y are relatives.
Who are joe's children?
How many children does joe have?
Are joe and steph relatives?

the URL is beloe, num ber one even though I am supposed to make them all. Please help and create some facts on your own.

http://www.sci.brooklyn.cuny.edu/~zhou/teaching/cis719/hw_prolog.html

 

[joel76]

If Y is the niece of X, Y is a girl, the father or mother of Y is a brother or sister of X.
if Y is the aunt of X, X is the niece of Y and Y is a girl.

 

[nesfrank]

and how can I build the program for niece, aunt and relative to express it?

 

[joel76]

You write exactly what I said

niece(X, Y) :-
    % Y is a girl
	girl(Y),
	% Z is the parent (father / mother)
	parent(Z, Y),
	% X et Z have same parents
	sibling(X, Z).

 

[joel76]

I apologize
"if Y is the aunt of X, X is the niece of Y and Y is a girl. " is a mistake

I should have written
"if Y is the aunt of X, Y is a girl and one parent of X is a sibling of Y. "

 

[nesfrank]

thanks, if u happen to test in your machine, please please post it here. I am a beginner. by the way where is this language used for? thanks so much and God bless.