Category:XPL0: Difference between revisions

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XPL0 has been implemented on more than a dozen processors, but it's

currently maintained ~~for~~ IBM-type PCs. Programs run under ~~DOS and under versions of~~ Windows ~~that can still run~~ DOS ~~apps~~. Free, open-source versions of the

currently maintained on the Raspberry Pi and IBM-type PCs. Programs run under Linux, Windows, and DOS. Free, open-source versions of the

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 compiler, XPLPX, was used for ~~all~~ these Rosetta Code tasks.

available from the official website: xpl0.org [http://www.xpl0.org/]. The 32-bit version of the DOS compiler, XPLPX, was used for most of these Rosetta Code tasks, but more recent tasks were implemented using the compilers for the Raspberry Pi.

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 ~~about~~ 80 of these built-in routines that

outputs strings. There are over a hundred of these built-in routines that

provide capabilities such as input and output, graphics, and trig

functions.

The Raspberry Pi versions of the compilers (as well as the Windows' version, EXPL-32) automatically declare ''code'' declarations. Thus the above program can simply be written as:

<pre>

Text(0, "Hello World!")

</pre>