Servo move to a location, then stop

[epideme]

@ruilviana

#include <Servo.h>

Servo myservo;  // create servo object to control a servo

const int ServoPin = 9;
const int ButtonPin = 8;
byte flag = 0;

void setup()
{
  pinMode(ButtonPin, INPUT_PULLUP);
  myservo.attach(ServoPin);  // attaches the servo on pin 9 to the servo object
}


void loop()
{
  if (digitalRead(ButtonPin) == LOW)
  {
    delay(30);
    if (digitalRead(ButtonPin) == LOW)
    {
      flag++;
    }
  }
  while (flag == 1)
  {
    for (int pos = 0; pos < 180; pos ++) // goes from 0 degrees to 180 degrees
    { // in steps of 1 degree
      myservo.write(pos);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15ms for the servo to reach the position
    }
    flag = 2;
  }

  while (flag == 3)
  {
    for (int pos = 180; pos > 0; pos--) // goes from 0 degrees to 180 degrees
    { // in steps of 1 degree
      myservo.write(pos);              // tell servo to go to position in variable 'pos'
      delay(15);                       // waits 15ms for the servo to reach the position
    }
    flag = 0;
  }
}

Swing and a hit! That got it.

Do you mind if I ask what the 'flag' bits of the code are/are for?