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	Any numeric variable.
expression1	Any expression.
expression2	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

*If expression1* is**	*And expression2* is**	*The result* is**

False	False	True
False	Null	True
Null	True	True
Null	False	Null
Null	Null	Null

The Imp operator performs a bit-wise comparison of identically positioned bits in two numeric expressions and sets the corresponding bit in result according to the following truth 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.

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 (bit-wise comparison).