A Servo Motor and a Potentiometer Code

#include <Servo.h>

Servo servo;

const int ServoPin=5;
const int PotPin=A0;
int PotVal;
int angle;



void setup()
{
 pinMode (PotPin, INPUT);
servo.attach (ServoPin);
Serial.begin (9600);

}

void loop()
{

PotVal= analogRead (PotPin);
angle= map (PotVal, 0, 1023, 0, 180);
angle= constrain (angle, 0, 180);
  servo.write(angle);//servo.write (180)
  delay (5);
}