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Imp Operator

office 365 dev account|Last Updated: 6/12/2017
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Used to perform a logical implication on two expressions. Syntaxresult=expression1Impexpression2. The Imp operator syntax has these parts:

PartDescription
resultRequired; any numeric variable.
expression1Required; any expression.
expression2Required; any expression.

Remarks The following table illustrates how result is determined:

If expression1 isAnd expression2 isThe result is
TrueTrueTrue
TrueFalseFalse
TrueNullNull
FalseTrueTrue
FalseFalseTrue
FalseNullTrue
NullTrueTrue
NullFalseNull
NullNullNull

The Imp operator performs a bitwise comparison of identically positioned bits in two numeric expressions and sets the corresponding bit in result according to the following table:

If bit in expression1 isAnd bit in expression2 isThe result is
001
011
100
111

Example

This example uses the Imp operator to perform logical implication on two expressions.

Dim A, B, C, D, MyCheck
A = 10: B = 8: C = 6: D = Null    ' Initialize variables.
MyCheck = A > B Imp B > C    ' Returns True.
MyCheck = A > B Imp C > B    ' Returns False.
MyCheck = B > A Imp C > B    ' Returns True.
MyCheck = B > A Imp C > D    ' Returns True.
MyCheck = C > D Imp B > A    ' Returns Null.
MyCheck = B Imp A    ' Returns -1 (bitwise comparison).
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