Try this code on for size....
neat property about the 'identity' feature of XOR'ing stuff...
Swap X & Y:
Method 1-
x = 1;
y = 2;
temp = x;
x = y;
y = temp;
Method 2-
x = 1;
y = 2;
x^=y^=x^=y;
Write it out on paper and see that it works  A swap with no (explicitly created) temporary variable.
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