why result didn't show in my swi- prolog editor?

Question

this is my editor . what is the problem?why the result didn't show (in this picture must show X=a , Y=b,c)?
http://i.imgur.com/LwweM.png?

Answer 1

Not sure - I don't use an IDE myself, but the program works OK. One thing to note is that you have singleton variables - does the IDE dislike that enough to stop it running ? Try using underscores (see my image, run 3).