XSB

XSB is a Prolog-based logic programming language, and it doesn’t have a direct equivalent to the traditional “Hello World” program. However, here’s an example of how you can print “Hello World!” using XSB:

:- dynamic hello/0.

hello :- 
    nl,
    write('Hello World!'),
    nl.

To run this code in XSB, save it to a file with the .xsb extension (e.g., hello.xsb) and then load the file into XSB. The output will be:

Hello World!

Here’s what’s happening in this code:

• We define a dynamic predicate hello/0, which means that we can query it even if it doesn’t have any facts associated with it.
• The hello clause defines the behavior of the hello predicate. It uses the nl directive to output a newline, then calls write('Hello World!') to print “Hello World!”, and finally outputs another newline.

When you load this file into XSB and query the hello predicate by typing hello. (note the period at the end), it will execute the code and print “Hello World!”

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