CODEWITHSUNDEEP
prologprolog-toplevel
Gavin
Gavin

Reputation: 2824

Prolog not showing full list of answer

When I run query human(Who). on the below .pl file

human(ann).
human(george).
human(mike).

I only get back Who = ann .

Instead of 

Who = ann ;
Who = george ;
Who = mike.

Am using prolog 6.6.6. How do I get it to show the full list?

Upvotes: 1

Views: 344

Answers (2)

false
false

Reputation: 10102

The answer you got was the following. Do you note the space before the dot?

Who = ann .
         ^ SPACE!!!

This space means: The query was aborted. Maybe you typed return. Or maybe you have a somewhat illconfigured terminal.

To better check this, try:

?- X = 1 ; X = 2 ; X = 3.

There you should get all three answers, too. If not, it is definitely your terminal

Upvotes: 2

Akshay Arora
Akshay Arora

Reputation: 1945

What you are seeing is the default behaviour of prolog.

The query

 ?-  findall(Object,Goal,List).

Should work for you.

Eg. 

findall(X, human(X), L).

It will populate the list with all possible answers.

Upvotes: 0

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