C language: Swap variables

A curious feature: howto swap numeric variables ezpz without a buffer using the bitwise XOR operation (bitwise exclusive OR):

#include <stdio.h>

int main(void)
{

    int a = 3;
    int b = 5;

    printf("a = %d, b = %d\n", a, b);
    a = a ^ b;
    // a   =   11
    // b   =  101
    // a^b =  110
    printf("a = %d, b = %d\n", a, b);
    b = a ^ b;
    // a   =  110
    // b   =  101
    // a^b =  011
    printf("a = %d, b = %d\n", a, b);
    a = a ^ b;
    // a   =  110
    // b   =  011
    // a^b =  101
    printf("a = %d, b = %d\n", a, b);

    return 0;
}

What the foo! 😀