PureBasic is an actively used programming language created in 1998. PureBasic is a commercially distributed procedural computer programming language and integrated development environment based on BASIC and developed by Fantaisie Software for Windows 32/64-bit, Linux 32/64-bit, and macOS. An Amiga version is available, although it has been discontinued and some parts of it are released as open source. The first public release of PureBasic for Windows was on December 17, 2000. Read more on Wikipedia...

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Example code from Linguist:

EnableExplicit

; ##################################################### Includes ####################################################

XIncludeFile "Includes/AudioOut.pbi"

; ##################################################### Prototypes ##################################################

; ##################################################### Structures ##################################################

; ##################################################### Constants ###################################################

#Samplerate = 44100

; ##################################################### Structures ##################################################

Structure Main
  *AudioOut
  
  Quit.i
EndStructure
Global Main.Main

Structure Main_Window
  ID.i
  
  TrackBar.i [10]
EndStructure
Global Main_Window.Main_Window

; ##################################################### Variables ###################################################

Global Frequency.d = 1000
Global Amplitude.d = 0.25

; ##################################################### Procedures ##################################################

Procedure Main_Window_Open()
  Main_Window\ID = OpenWindow(#PB_Any, 0, 0, 800, 100, "AudioOut Example", #PB_Window_SystemMenu | #PB_Window_MinimizeGadget | #PB_Window_ScreenCentered)
  
  If Main_Window\ID
    
    Main_Window\TrackBar[0] = TrackBarGadget(#PB_Any, 10, 10, 780, 30, 0, 20000)
    SetGadgetState(Main_Window\TrackBar[0], Frequency)
    
    Main_Window\TrackBar[1] = TrackBarGadget(#PB_Any, 10, 40, 780, 30, 0, 1000)
    SetGadgetState(Main_Window\TrackBar[1], Amplitude*1000)
    
  EndIf
EndProcedure

Procedure Notifier_CallBack(*AudioOut)
  Protected *Temp, Temp_Size.i
  Static Rotation.d
  
  While AudioOut::GetQueuedBlocks(*AudioOut) <= 3
    
    Temp_Size = AudioOut::GetBufferBlocksize(*AudioOut)
    If Temp_Size > 0
      *Temp = AllocateMemory(Temp_Size)
      
      Define Left.d, Right.d, i
      For i = 0 To Temp_Size / 4 - 1
        Left = Sin(Rotation) * Amplitude
        Right = Sin(Rotation) * Amplitude
        
        PokeW(*Temp + i*4    , Left*32767)
        PokeW(*Temp + i*4 + 2, Right*32767)
        
        Rotation + 2.0*#PI / #Samplerate * Frequency
      Next
      
      AudioOut::Write_Data(Main\AudioOut, *Temp, Temp_Size)
      
      FreeMemory(*Temp)
    EndIf
    
  Wend
EndProcedure

; ##################################################### Initialisation ##############################################

Main_Window_Open()

AudioOut::GetDevices()

ForEach AudioOut::Device()
  Debug PeekS(AudioOut::@Device()\szPname)
Next

Main\AudioOut = AudioOut::Initialize(#WAVE_MAPPER, #Samplerate, 2, 16, @Notifier_CallBack())

If Not Main\AudioOut
  Debug AudioOut::GetError()
  End
EndIf

Notifier_CallBack(Main\AudioOut)

; ##################################################### Main ########################################################

Repeat
  
  Repeat
    Select WaitWindowEvent(100)
      Case #PB_Event_Gadget
        Select EventGadget()
          Case Main_Window\TrackBar[0]
            Frequency = GetGadgetState(Main_Window\TrackBar[0])
            Debug Frequency
            
          Case Main_Window\TrackBar[1]
            Amplitude = GetGadgetState(Main_Window\TrackBar[1]) / 1000
            
        EndSelect
        
      Case #PB_Event_CloseWindow
        Main\Quit = #True
        
      Case 0
        Break
    EndSelect
  ForEver
  
Until Main\Quit

; ##################################################### End #########################################################

AudioOut::Deinitialize(Main\AudioOut)

; IDE Options = PureBasic 5.30 Beta 2 (Windows - x64)
; CursorPosition = 109
; FirstLine = 79
; Folding = -
; EnableUnicode
; EnableThread
; EnableXP

Example code from Wikipedia:

Structure type_name
   field_name.type ; Single field. Perhaps the structures attachment.
   field_name[count].type ; Static arrays.
   ; ... 
   ; Optional construction StructureUnion .. EndStructureUnion allows you
   ; to combine multiple fields into one area of memory
   ; that is sometimes required for the conversion types.
   StructureUnion
      type_name.type
      ; ... 
   EndStructureUnion 
EndStructure

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Last updated August 9th, 2020

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