Swap x and y without using temp variable
tmp = x
x = y
y = tmp
-----------------
x=x+y
y=x-y
x=x-y
Drawbacks :
1) It can cause overflow in the operation (+)
2) It can cause underflow on operation (-) ----------------- x=x*y y=x/y x=x/y----------------------
x = x xor yWe don't have problem of either underflow or overflow! but it fails for swapping of same value results 0.
y = x xor y
x = x xor y
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