Campbell CR5000, Руководство оператора

Страница: 191 / 238

Section 8. Processing and Math Instructions
8-19
Remarks
The following table illustrates how Result is determined:
If expr is The result is
True False
False True
Null Null
The NOT operator also inverts the bit values of any variable and sets the
corresponding bit in result according to the following truth table:
If bit in expr1 is The result is
0 1
1 0
NOT Operator Example
The example sets the value of the variable Msg depending on the state of
Flag(1).
Dim A, B, C, Flag(8) 'Declare variables.
Public Msg
If NOT Flag(1) Then
'Evaluate expressions.
Msg = 10
Else
Msg = 100.
End If
Or
Used to perform a logical disjunction on two expressions.
Syntax
result = expr1 Or expr2
Remarks
If either or both expressions evaluate True, result is True. The following table
illustrates how result is determined:
If expr1 is And expr2 The result
is is is
True True True
True False True
False True True
False False False
The Or operator also performs a bit-wise comparison of identically positioned
bits in two numeric expressions and sets the corresponding bit in result
according to the following truth table: