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Home » Tip Bank » C++
Language: C++
Expertise: Intermediate
Aug 4, 2000

Another Technique for Swapping Two Integers Without Using a Temporary

In a previous tip, I showed how to swap two variables without using a temporary variable. There's another version of this solution that applies to integral values only. Here it is:

 
void swap(int& i, int& j)
{
 i ^= j;
 j ^= i;
 i ^= j;
}// i and j are swapped

You can apply this technique to any integral type, e.g., char, short, unsigned long, but not to floating-point variables.

Danny Kalev
 
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