/* bitwise swaps */

int main()
{
    int a = 42, b = 3;
    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);

    return 0;
}

a = 42, b = 3
a = 3, b = 42