int switchPin = 2;
int redLedPin = 8;
int greenLedPin = 9;

void setup() {
  pinMode(switchPin, INPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  digitalWrite(redLedPin, LOW);
  digitalWrite(greenLedPin, LOW);
}

void loop() {
  int switchState = digitalRead(switchPin);
  
  if (switchState == HIGH) {
    digitalWrite(redLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
  } else {
    digitalWrite(redLedPin, LOW);
    digitalWrite(greenLedPin, HIGH);
  }
}