# Xor operator

Used to perform a logical exclusion on two expressions.

## Syntax

[ result = ] expression1 Xor expression2

The Xor operator syntax has these parts:

Part Description
result Optional; any numeric variable.
expression1 Required; any expression.
expression2 Required; any expression.

## Remarks

If one, and only one, of the expressions evaluates to True, result is True. However, if either expression is Null, result is also Null.

When neither expression is Null, result is determined according to the following table.

If expression1 is And expression2 is Then result is
True True False
True False True
False True True
False False False

The Xor operator performs as both a logical and bitwise operator. A bitwise comparison of two expressions using exclusive-or logic to form the result, is shown in the following table.

If bit in expression1 is And bit in expression2 is Then result is
0 0 0
0 1 1
1 0 1
1 1 0

## Example

This example uses the Xor operator to perform logical exclusion on two expressions.

``````Dim A, B, C, D, MyCheck
A = 10: B = 8: C = 6: D = Null    ' Initialize variables.
MyCheck = A > B Xor B > C    ' Returns False.
MyCheck = B > A Xor B > C    ' Returns True.
MyCheck = B > A Xor C > B    ' Returns False.
MyCheck = B > D Xor A > B    ' Returns Null.
MyCheck = A Xor B    ' Returns 2 (bitwise comparison).
``````