10. Swapping int(s) - direct din params (ASM)

volatile byte a=0xaa;
volatile byte b=0xbb;
void setup()
{
  Serial.begin(9600);
  asm("" : "=r" (a) , "=r" (b): "0" (b), "1" (a)
       //  baga in %0 ce ai in "b" ^^^
      );
  Serial.print("a = "); Serial.println(a,HEX);
  Serial.print("b = "); Serial.println(b,HEX);
}

void loop(){}