APL Wiki HelloWorld;ref;btn;myFnt
⍝ Build up a GUI and display "Hello world" in a button on a Form
ref←⎕NEW'Form'(⊂'Caption' 'Hello World with APL')
ref.Coord←'Pixel'
myFnt←⎕NEW'Font'(('Pname' 'Arial Black')('Size' 48))
btn←ref.⎕NEW'Button'(('Caption' 'Hello World')('Posn'(0 0))('Size'ref.Size))
btn.FontObj←myFnt
btn.onSelect←1
⎕DQ'.'This is inline ⎕LX←'HelloWorld' APL
This program will result in this form:
attachment:helloworld.jpg