Category:XPL0: Difference between revisions
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by Peter J. R. Boyle, who designed it to run on a 6502 microprocessor as
an alternative to BASIC, which was the dominant language for personal
computers at the time. XPL0 is based on [[PL/0]], an example compiler in the
book ''Algorithms + Data Structures = Programs'' by Niklaus Wirth. The first
XPL0 compiler was written in ALGOL, which was then used to create a compiler
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XPL0 has been implemented on more than a dozen processors, but it's
currently maintained
compilers (interpreted, assembly-code compiled, and optimizing) are
available from the official website: xpl0.org [http://www.xpl0.org/]. The 32-bit version of the MS-DOS compiler, XPLPX, was used for
Here's how the traditional Hello World program is coded:
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All names must be declared before they can be used. The command word
''code'' associates the name Text to the built-in routine number 12, which
outputs strings. There are
provide capabilities such as input and output, graphics, and trig
functions.
The 32-bit versions of the compilers (as opposed to the older, 16-bit versions) automatically declare ''code'' declarations. Thus the above program can simply be rewritten as:
<pre>
Text(0, "Hello World!")
</pre>
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