Topic       : The GFA-Basic Compendium
Author      : GFA Systemtechnik GmbH
Version     : GFABasic.HYP v2.98 (12/31/2023)
Subject     : Documentation/Programming
Nodes       : 899
Index Size  : 28056
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
@lang       : 
@default    : Document not found
@help       : Help
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@width      : 75
@hostname   : STRNGSRV
@hostname   : CAB     
@hostname   : HIGHWIRE
@hostname   : THING   
View Ref-FileW:x
L:x

x: iexp

These two functions enable the user to pass numerical expressions to Operating
System functions and C-routines as either word (2-byte, W:) or longword
(4-byte, L:). By default the word format is used.

Example:

    DIM screen_2|(32255)
    phys_base%=XBIOS(2)
    old_screen%=phys_base%
    log_base%=V:screen_2|(0)+255 AND &HFFFFFF00
    ~XBIOS(5,L:log_base%,L:phys_base%,-1)
    SWAP log_base%,phys_base%
    REPEAT
      IF MOUSEK=1
        ~XBIOS(5,L:log_base%,L:phys_base%,-1)
        SWAP log_base%,phys_base%
        REPEAT
        UNTIL MOUSEK=0
      ENDIF
      PLOT MOUSEX,MOUSEY
    UNTIL MOUSEK=2
    ~XBIOS(5,L:old_screen%,L:old_screen%,-1)

--> XBIOS(5) is used to switch between two display screens each time the left
    mouse button is pressed. Moving the mouse causes points to be plotted on
    the screen which is not currently visible. Pressing the right mouse button
    terminates the program.