SWAP two value without using temp storage..

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hi guys, i have a problem here,

int X = 150;
int y = 45;

i must swap the two values without using a temporary variable.

result should be like this:

X = 45
and
y=150

any solutions guys., thanks

Posted 21-Jul-10 20:06pm

lgmanuel

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Peter_in_2780 · Answer 1 · 2010-07-21T20:31:00

Solution 2

The classic way is to use XOR three times:

a ^= b;
b ^= a;
a ^= b;

Now go figure out why it works!

Posted 21-Jul-10 20:31pm

Peter_in_2780

Sandeep Mewara · Answer 2 · 2010-07-21T20:40:00

Solution 3

Here you go!

C++

int x = 10
int y = 20

x = x+y;
y = x-y;
x = x-y;

// Print swapped values!
cout << x    //20
cout << y    //10

Posted 21-Jul-10 20:40pm

Sandeep Mewara

Christian Graus · Answer 3 · 2010-07-21T20:14:00

Solution 1

I can think of a convoluted solution, which involves working out if each bit is different, and if it is, swapping them both. It seems like a retarded thing to do, however.

Posted 21-Jul-10 20:14pm

Christian Graus

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Sandeep Mewara 22-Jul-10 2:58am

Actually this is an old question generally asked by tech people to check aptitude!