And operator
Used to perform a bitwise conjunction on two expressions.
Syntax:
result = expression1 And expression2
- result
- Any numeric variable.
- expression1, expression2
- Any expressions.
If both expressions evaluate to True, result is True. If either expression evaluates to False, result is False. 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 | False |
| False | False | False |
| False | Null | False |
| Null | True | Null |
| Null | False | False |
| Null | Null | Null |
The And 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 | 0 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
INFO
And evaluates both operands every time, even when expression1 alone determines the result. Use AndAlso for short-circuit evaluation --- for example, when expression2 is expensive, has side effects, or would fail without the guard provided by expression1.
Example
This example uses the And operator to perform a logical conjunction on two expressions.
Dim A, B, C, D, MyCheck
A = 10: B = 8: C = 6: D = Null ' Initialize variables.
MyCheck = A > B And B > C ' Returns True.
MyCheck = B > A And B > C ' Returns False.
MyCheck = A > B And B > D ' Returns Null.
MyCheck = A And B ' Returns 8 (bitwise comparison).