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Syntax
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Boolean
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Description
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A data type capable of representing the logical values TRUE and FALSE
.
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Comments
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Boolean
variables are used to hold a binary value—either TRUE or FALSE. Variables can be declared as
Boolean
using the
Dim
,
Public
, or
Private
statement.
Variants can hold
Boolean
values when assigned the results of comparisons or the constants TRUE or FALSE.
Internally, a
Boolean
variable is a 2-byte value holding –1 (for TRUE) or 0 (for FALSE).
Any type of data can be assigned to
Boolean
variables. When assigning, non-0 values are converted to TRUE
,
and 0 values are converted to FALSE.
When appearing as a structure member,
Boolean
members require 2 bytes of storage.
When used within binary or random files, 2 bytes of storage are required.
When passed to external routines,
Boolean
values are sign-extended to the size of an integer on that platform (either 16 or 32 bits) before pushing onto the stack.
There is no type-declaration character for
Boolean
variables.
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Boolean
variables that have not yet been assigned are given an initial value of
False
.
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See Also
|
Currency (data type); Date (data type); Double (data type); Integer (data type); Long (data type); Object (data type); Single (data type); String (data type); Variant (data type); DefType (statement); CBool (function); True (constant); False (constant).
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CIMPLICITY