Imp operator

Used to perform a bitwise implication on two expressions. expression1 Imp expression2 is False only when expression1 is True and expression2 is False; in every other non-Null case the result is True.

Syntax:

result = expression1 Imp expression2

result

Any numeric variable.

expression1, expression2

Any expressions.

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

INFO

Imp always evaluates both operands.

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

• Eqv operator
• Xor operator
• And operator
• Or operator
• Operators