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Posted 18 Feb 2012

Swap Two Numbers without using Temp Variable

, 18 Feb 2012
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You can do it with some XORs:int a = 25, b = 7;a = a ^ b;b = b ^ a;a = a ^ b;Or the same thing with some shorthand to make the code even harder to read:a ^= b;b ^= a;a ^= b;
You can do it with some XORs:

int a = 25, b = 7;

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

Or the same thing with some shorthand to make the code even harder to read:
a ^= b;
b ^= a;
a ^= b;


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Comments and Discussions

Questionswap without using temp variable Pin
iSkyTreasure29-Aug-12 6:09
memberiSkyTreasure29-Aug-12 6:09 
Questionw/o vs with : which one is fastest? Pin
Alex Ten28-Apr-12 3:45
memberAlex Ten28-Apr-12 3:45 
GeneralProbably the most useful varient of this was on the old IBM ... Pin
Chuck O'Toole19-Feb-12 9:17
memberChuck O'Toole19-Feb-12 9:17 
GeneralReason for my vote of 5 That's *the* established way since t... Pin
Andreas Gieriet19-Feb-12 8:18
memberAndreas Gieriet19-Feb-12 8:18 
GeneralI prefer: a ^= b; b ^= a; a ^= b; because: 1. no overflow ... Pin
Huisheng Chen18-Feb-12 18:53
memberHuisheng Chen18-Feb-12 18:53 

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