expected primary expression before ')' token
Why are you putting byte there? That isn't in the Serial.print reference page.

This compiles OK:

#define ANALOG_IN 0

void setup() {
  Serial.begin(19200);
  analogReference(INTERNAL);
}

void loop() {
  int val = analogRead(ANALOG_IN);
  Serial.print(0xff);
  Serial.print( (val &gt;&gt; 8) &amp; 0xff);
  Serial.print( val &amp; 0xff);
}