On 06/13/2011 05:22 PM, tech rascal wrote:
just a small doubt.....
if x=10 and y=20
thn wht wud b the value of (x ^ y)?
acc to me....it has to be 1 bt if the value is 1 , thn how wud the
method using XOR operations work?.....plz xplain
On Mon, Jun 13, 2011 at 3:18 AM, KK <[email protected]
<mailto:[email protected]>> wrote:
@kunal
Actually its not same value its the same variable and it arises only
if u code the given way(and some people do it this way)....
void swap(int &a, int &b)
{
a ^= b ^= a ^= b;
}
now we have
int a = 10;
swap(a, a)
This will set a's value to 0...and this happens while sorting arrays
when u pass the same index values...
Conclusion: Either code as given in above Q or use the temporary
var...
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Try this
void swap(int *x, int *y)
{
if (*x != *y) {
*x ^= *y;
*y ^= *x;
*x ^= *y;
}
}
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Felipe Ferreri Tonello
felipetonello.com
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