xor operator

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xor		operator

Syntax
result = exprA { xor | ^^ } exprB

Description
Expression exprA and expression exprB are each interpreted as 32-bit integer quantities. The xor operator performs a "bitwise comparison" of each bit in exprA with the bit in the corresponding posistion in exprB. The result is another 32-bit quantity; each bit in the result is determined as follows:

Bit value in expr	Bit value in expr	Bit value in result
0	0	0
1	0	1
0	1	1
1	1	0

A common use for xor is to toggle the state of individual bits in a bit pattern. For example:
pattern = pattern xor bit(7)

This flips bit 7 in pattern from 0 to 1 or from 1 to 0, and leaves all of pattern's other bits alone.

Example
The example below shows how bits are manipulated with xor:


defstr long

print bin$(923)

print bin$(123)

print "--------------------------------"

print bin$(923 xor 123)

program output:
00000000000000000000001110011011 00000000000000000000000001111011 -------------------------------- 00000000000000000000001111100000

See also
and; or; not