= Hello world =

Many programming language manuals start by showing how easy it is to write a "Hello world" program in that language. In APL we pride ourselves with the shortest ... start APL and type:

{{{'Hello World'}}}

APLers are used to the idea of using the session as an input/output interface. The rest of the world might not consider that this qualifies as a program. In mswindows for instance a program might be defined as something we can call from the '''Run...''' dialog box or set up as a shortcut on the desktop. 

To get our program into a state where we can do that requires a choice between a number of alternative routes. The easiest way is to create an APL workspace which executes 'Hello World' when loaded. Here's an example [[HelloWorldSession]] which uses Dyalog APL, but you can do something similar in most implementations of APL.

You may want to do something more sophisticated like writing a GUI application or creating an HTML web page. This can be very easy in APL, but the exact details vary from one APL vendor to another...

Here are a few possible approaches if you are using Dyalog APL:

 * [[HelloWorldGui|GUI]]
 * [[HelloWorldHtml|HTML]]
 * [[HelloWorldOle|OLE]]

Here is a TCP/IP communications example using APL+WIN

 * [[HelloWorldTcpIp|TCP/IP Communications]]

----
CategoryHelloWorld - CategoryDyalog - CategoryAplx