Imp Operator

Description

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


See Also

Operator precedence.

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).