Imp operator
Used to perform a logical implication on two expressions.
Syntax
result=expression1 Imp expression2
The Imp operator syntax has these parts:
| Part | Description |
|---|---|
| result | Required; any numeric variable. |
| expression1 | Required; any expression. |
| expression2 | Required; any expression. |
Remarks
The following table illustrates how result is determined.
| If expression1 is | And expression2 is | The result is |
|---|---|---|
| True | True | True |
| True | False | False |
| True | Null | Null |
| False | True | True |
| False | False | True |
| False | Null | True |
| Null | True | True |
| Null | False | Null |
| Null | Null | Null |
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 is | And bit in expression2 is | The result is |
|---|---|---|
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
Example
This example uses the Imp operator to perform a 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).
See also
Support and feedback
Have questions or feedback about Office VBA or this documentation? Please see Office VBA support and feedback for guidance about the ways you can receive support and provide feedback.