Arduino Assignment 9

#include <Servo.h>

Servo myServo;
int servoPin = 9;
int pos = 0;
int buttonPinL = 2;
int buttonPinR = 3;
int buttonL = 0;
int buttonR = 0;

void setup() {
  Serial.begin(9600);
  myServo.attach(servoPin);
  pinMode(buttonPinL, INPUT);
  pinMode(buttonPinR, INPUT);

}

void loop() {
  buttonL = digitalRead(buttonPinL);
  buttonR = digitalRead(buttonPinR);

  if (buttonL == HIGH) {
    Serial.print("links");
    for (pos = 0; pos < 180; pos +=180) {
      myServo.write(pos);
    }
  } else if (buttonR == HIGH) {
    Serial.print("rechts");
    for (pos = 180; pos >= 1; pos -=180) {
     myServo.write(pos);
    }
  }

}