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How to swap two variables, without using third variable ?
Answer Posted / trinath somarouthu
using X-OR
#define SWAP(x,y) x^=y^=x^=y
x = x ^ y --> x^=y -- (1)
y = y ^ x --> y^=x -- (2)
x = x ^ y --> x^=y -- (3)
(3) in (2) --> y^=x^=y -- (4)
(4) in (1) --> x^=y^=x^=y -- :-)
all togeather, he single line code
#define SWAP(x,y) x^=y^=x^=y
| Is This Answer Correct ? | 17 Yes | 13 No |
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