void setup() {
  Serial.begin(115200);

  uint8_t xx, yy, zz;
  
  xx = 100;
  yy = 200;
  zz = yy - xx;


    Serial.print(yy); Serial.print(" - ");
    Serial.print(xx); Serial.print(" = "); 
    Serial.println(zz);

  xx = 103;
  yy = 25;
  zz = yy - xx;


    Serial.print(yy); Serial.print(" - ");
    Serial.print(xx); Serial.print(" = "); 
    Serial.println(zz);
 
}

void loop() {}