64. Interrupt Operation

What will happen to the LED when Mark presses the button? (After executing the following code on Arduino)?

Note: Consider that no noise is created from button press.

Code:

#define BUTTON_PIN 2  
#define LED_PIN 10  

void toggleLED() {  
  digitalWrite(LED_PIN, !digitalRead(LED_PIN));  
}

void setup() {  
  pinMode(BUTTON_PIN, INPUT_PULLUP);  
  pinMode(LED_PIN, OUTPUT);  
  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), toggleLED, FALLING);  
}

void loop() { }