using ^= to swap two integers

[J.WOOD]

Regarding swapping via the xor operation as in:


	b ^= a ^= b ^= a;
	
be careful that a and b are not at the same address
as when using pointers.  In that case the value(s) are (both)
set to zero.  I got burned on this once.



					Joseph L. Wood, III
					AT&T Information Systems
					Laboratories, Holmdel
					(201) 834-3759
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