XSB

The XSB (XBase Subset) is a declarative, rule-based programming language derived from Prolog. It’s not a widely used or well-documented language, so providing specific code examples can be challenging. However, to write “Hello World!” in a Prolog-like language like XSB, you might express it using a simple fact and then query that fact.

Here’s how you could do it:

% Define a fact to print "Hello World!"
print("Hello World!") :-
    true.

% Query the fact to execute the program
?- print("Hello World!").

In this code snippet:
– % is used to comment out text.
– print("Hello World!") is a predicate that prints the given string.
– :- introduces a rule.
– true is a simple fact that always holds true.
– ?- is used for interactive querying, similar to Prolog’s interactive shell.

When you query print("Hello World!")., the system will execute the rule and output “Hello World!” to the console.

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