# Imp operator

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

## 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).``````