const int led_pins[8]={19,18,5,17,16,4,0,2};
const int on_button=12;
const int off_button=14;
void setup(){
  pinMode(on_button, INPUT_PULLUP);
  pinMode(off_button, INPUT_PULLUP);
  for(int i=0;i<8;i++){
    pinMode(led_pins[i], OUTPUT);
  }
  all_off();

}
void loop(){
  if(digitalRead(on_button)==0){
    all_on();

  }
  if(digitalRead(off_button)==0){
    all_off();
 }
}
void all_off(void){
  for(int i=0;i<8;i++){
    digitalWrite(led_pins[i], LOW);
  }
}
void all_on(void){
  for(int i=0;i<8;i++){
    digitalWrite(led_pins[i], HIGH);
  }
}