Hold data after turning off the Arduino (EEPROM)

1#include <EEPROM.h>
2
3void setup() {
4  pinMode(10, INPUT_PULLUP);  //because of the pullup resistor we dont need an external resistor
5  pinMode(LED_BUILTIN,  OUTPUT);
6}
7
8
9
10void loop() {
11  bool button_pressed = digitalRead(10);
12
13  if(!button_pressed && EEPROM.read(0) == 0){
14    EEPROM.write(0, 1); //EEPROM.write(address,  value) ; the value should be between 0 and 255
15  }
16  
17  else if(!button_pressed){
18    EEPROM.update(0, 0);  //the update function writes only to the EEPROM if the  new value 
19                          //is not the same as the old one. In some  cases this is very important
20                          //to save cylces on the  EEPROM.
21  }
22
23  delay(100);
24  digitalWrite(LED_BUILTIN, EEPROM.read(0));
25}