const int kPinButton1 = 2;
const int kPinLed = 9;
void setup() {
  // put your setup code here, to run once:
    pinMode(kPinButton1, INPUT);
    digitalWrite(kPinButton1, HIGH);
    pinMode(kPinLed, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
if (digitalRead(kPinButton1)==LOW){
  digitalWrite(kPinLed, HIGH);
}else{
  digitalWrite(kPinLed,LOW);
}
}