Controling servo motors with buttons and arduino

1int button = 2;   //pin of the first button
2int button1 = 3;  //pin  of the second button
3#include<Servo.h> //include the servo library
4Servo servo;  //create a servo object
5int pos = 0;  //initial position of the servo
6void  setup() {
7  // put your setup code here, to run once:
8  servo.attach(9);  //pin  used by the servo
9  pinMode(button, INPUT_PULLUP);  //define first button as  input pullup
10  pinMode(button1, INPUT_PULLUP); //define second button as input  pullup
11  /*
12  INPUT_PULLUP send to arduino LOW signal, so, when you press  the button, you send a LOW signal to arduino
13  */
14}
15
16void loop() {
17  // put your main code here, to run repeatedly:
18  if (digitalRead(button) ==  LOW) { //if Value read of the button ==LOW:
19    pos++;  //increases the value  of the "pos" variable each time the push button of the left is pressed
20    delay(5);  //5 milliseconds of delay
21    servo.write(pos); //servo goes to variable pos
22  }
23  if (digitalRead(button1) == LOW) { //if Value read of the button ==LOW:
24    pos--;  //decreases the value of the "pos" variable each time the push button  of the right is pressed
25    delay(5); //5 milliseconds of delay
26    servo.write(pos);  //servo goes to variable pos
27  }
28}