Topic       : The GFA-Basic Compendium
Author      : GFA Systemtechnik GmbH
Version     : GFABasic.HYP v2.98 (12/31/2023)
Subject     : Documentation/Programming
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View Ref-FileNOT x

x: iexp

The operator NOT negates a given logical expression. It is the only logical
operator, which has a single argument. Each individual bit of the argument is
modified.

    x | NOT x
    --|------
    T | F
    F | T

Examples:

    PRINT NOT FALSE
    PRINT NOT TRUE
    PRINT NOT 0

--> The numbers -1, 0, and -1 appear on the screen.

    x=1
    PRINT BIN$(x,2)
    PRINT BIN$(NOT x,2)

--> 01 and 10 appear on the screen.

    x%=17
    PRINT BIN$(x%,8),x%
    PRINT BIN$(NOT x%,8),NOT x%

--> Displays 00010001, 17, 11101110, and -18 on the screen.

Memo: IF NOT v
      It's amazing how often even experience programmers will forget that
      NOT v is not the same as NOT v! and end up with a logical test that
      doesn't work.