Prolog - Display prime numbers

Question

I am new to Prolog programming so still learning. I'm tryingto create a program that accepts a value X and returns a list of all prime numbers between 6 and X. I'll also be later adding an error output if X is entered as 6 or lower.

I have come up with the below code so far to have the value of x entered, y as the first prime number and the counter as 1. Even this is not working, as I try to increment the values of Y. If i can get this working I plan to then add conditions to only show Y if it is a prime, by checking that it divides by itself and 1.

If anyone has any advice it would be greatly appreciated.

prime (X, Y, Counter) :-
    X >= Y,
    writeln(Y),
    Next is Y + Counter,
    prime (X, Next, Counter).

prime(X, Y, _) :-
     Y > X.

TessellatingHeckler · Accepted Answer · 2022-07-02 23:21:41Z

0

Remove the spaces in prime ( here and here:

Then it works to call ?- prime(10, 3, 1). and have it count.

answered Jul 2, 2022 at 23:21

TessellatingHeckler

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1 Comment

Cik02 Over a year ago

Thanks @TessellatingHeckler. I'm just getting a chance to revisit this now, since last week but you but answer helped me. I didn't realise my mistake in the spacing on my code. Do you know the best method to go to get my program to then list all prime numbers between 6 and my chosen value Y?

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