void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  int x = analogRead(A0);

  Serial.print("If x = analogRead(A0), and x = ");
  Serial.print(x);
  Serial.println(", what will be the output of this code?");
  Serial.print("x is...\n");
  delay(5000);
  if (x = 128) Serial.println("128");
  if (x = 129) Serial.println("one hundred-twenty-nine");
  if (x = 32767) Serial.println("large!!!!");
  if (x = 0) Serial.println("zero");
  else Serial.println("definitely not zero");
  if (x = -15) Serial.println("Minus 15");
  Serial.print("##### End of loop:  x = ");
  Serial.println(x);
  Serial.print("\nSee https://www.gammon.com.au/tips#trap3 \n");
  delay(5000);

}