C++ USES an xor operation to exchange the values of two Numbers

It is the least expensive method to exchange the value of two Numbers without mediation. The simple principle is that the negative of xor is positive

Code:

#include <stdio.h>

int main()
{
 int a = 11, b = 22;
 printf("a=%d b=%d\n", a, b);
 a = a ^ b;
 b = a ^ b;
 a = a ^ b;
 printf("a=%d b=%d\n", a, b);
}

Compile:
gcc test.c -o test

Perform:
a=11 b=22
a=22 b=11