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This snippet submitted by David Nielsen on 2005-05-30. It has been viewed 16687 times.
Rating of 3.0158 with 190 votes Three ways to do a swap void swap1(int a, int b)
{
int c = a;
a = b;
b = c;
}
void swap2(int a, int b)
{
// notice: swap2(x, x) doesn't work
// undefined behavior using this method with floats
a = a ^ b;
b = a ^ b;
a = a ^ b;
//or...
//a ^= b;
//b ^= a;
//a ^= b;
}
void swap3(int a, int b)
{
// notice: overflow should work, but behaviour is undefined
a = a + b;
b = a - b;
a = a - b;
}
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