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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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GregEllis

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Comments and Discussions

 
Questionswap without using temp variable PinmemberiSkyTreasure29-Aug-12 6:09 
Questionw/o vs with : which one is fastest? PinmemberAlex Ten28-Apr-12 3:45 
GeneralProbably the most useful varient of this was on the old IBM ... PinmemberChuck O'Toole19-Feb-12 9:17 
GeneralReason for my vote of 5 That's *the* established way since t... PinmemberAndreas Gieriet19-Feb-12 8:18 
GeneralI prefer: a ^= b; b ^= a; a ^= b; because: 1. no overflow ... PinmemberHuisheng Chen18-Feb-12 18:53 

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