March 2000
Intermediate to advanced
576 pages
18h 13m
English
Content preview from Delphi in a Nutshell
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Name
Not Keyword
Syntax
notBoolean expressionnotInteger expression
Description
The not operator
performs a negation. If the operand has type
Boolean, the negative is a logical negation
(not
False =
True and not
True = False). If the operand
is an integer, the not operator performs a bitwise
negation of each bit in the integer value. In other words, it
performs a complement operation.
Tips and Tricks
The ByteBool, LongBool, and
WordBool types interpret any non-zero ordinal
value as True. When not returns True, it always
returns an ordinal value of -1. In other words,
not
not
X
does not always have the same ordinal value as X.
If the ordinal value of a logical variable matters, you should use an
integer type and not a logical type.
See Also
| And Keyword, Boolean Type, False Constant, Integer Type, Or Keyword, True Constant, Xor Keyword |
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