Help with prolog

[PeterCai]

Not a homework question, I am studying prolog by myself, and ran into this problem in an online tutorial.

so the problem is: make a predicate seq(?X,+Y) where Y is a natural number, and X is a natural number smaller than Y.

could someone give me a tip on how to deal with problems like this?

+ means it is instaniated, ? means it may or may not be instantiated.

[b.i.o]

It's kind of hard to give you a tip without any idea of what you've tried/thought of. First: do you have any experience doing functional programming? (It'll make your life a lot easier, but Prolog doesn't behave like you might expect it would.) Second: what Prolog implementation are you using?

[PeterCai]

It's kind of hard to give you a tip without any idea of what you've tried/thought of. First: do you have any experience doing functional programming? (It'll make your life a lot easier, but Prolog doesn't behave like you might expect it would.) Second: what Prolog implementation are you using?

i have expierence with functional programing. and i am using swi-prolog.

[PeterCai]

nvm, got it