A Simple First Example

Open Visual Prolog

At top of page, select Project Open. Go to directory containing Visual Prolog Examples, open PIE directory, select PIE application. The following screen will appear.

At top of page, select Build, then Execute. When asked if want to register program, select Continue Evaluation. Click that you understand the program cannot be distributed commercially. You will then see the following screen.

At top of page, select File, New. On the screen provided, type the following

father("Bill", "John").

father("Pam", "Bill").

grandFather(Person, GrandFather):-

  father(Father, GrandFather), father(Person, Father). 

At top of page, select Engine, Reconsult

At top of page, select File, Consult. Highlight the file you are working on (FILE0 in this case) and click Open - as shown below.

In the Dialog box (open the Dialog box by selecting Window, Dialog type the following

    father("Sue", "John"). 

Press Return

In the Dialog box type the following

    father(X,Y).

Press return

Output for each query is presented below.