Or operator
Used to perform a logical disjunction on two expressions.
Syntax:
result = expression1 Or expression2
- result
- Any numeric variable.
- expression1, expression2
- Any expressions.
If either or both expressions evaluate to True, result is True. The following table illustrates how result is determined:
| If expression1 is | And expression2 is | Then result is |
|---|---|---|
| True | True | True |
| True | False | True |
| True | Null | True |
| False | True | True |
| False | False | False |
| False | Null | Null |
| Null | True | True |
| Null | False | Null |
| Null | Null | Null |
The Or operator also 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 | Then result is |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
Note
Or evaluates both operands every time, even when expression1 alone determines the result. Use OrElse when you want short-circuit evaluation — for example, when expression2 is expensive, has side effects, or only matters when expression1 is False.
Example
This example uses the Or operator to perform logical disjunction on two expressions.
Dim A, B, C, D, MyCheck
A = 10: B = 8: C = 6: D = Null ' Initialize variables.
MyCheck = A > B Or B > C ' Returns True.
MyCheck = B > A Or B > C ' Returns True.
MyCheck = A > B Or B > D ' Returns True.
MyCheck = B > D Or B > A ' Returns Null.
MyCheck = A Or B ' Returns 10 (bitwise comparison).