Skip to content

Instantly share code, notes, and snippets.

@NatashaTheRobot
Created October 31, 2011 01:27
Show Gist options
  • Save NatashaTheRobot/1326699 to your computer and use it in GitHub Desktop.
Save NatashaTheRobot/1326699 to your computer and use it in GitHub Desktop.
This is the solution to the Karel Defends Democracy Stanford 106A Section Problem
/* Karel is cleaning up the voting ballot.
* The vote only counts if the middle rectangle is punched,
* which means there are no beepers present.
*/
import stanford.karel.SuperKarel;
public class defendDemocracyKarel extends SuperKarel {
public void run() {
while (frontIsClear()) {
move();
checkMiddleBeeper();
cleanExtraBeepers();
move();
}
}
private void checkMiddleBeeper() {
if (beepersPresent()) {
move();
move();
}
}
private void cleanExtraBeepers() {
if (noBeepersPresent()) {
cleanBeepersSouth();
cleanBeepersNorth();
}
}
/* Karel moves South, checks for beepers, and picks them up
* if there are any there.
* Pre-condition: Karel is in the middle of a rectangle with no
* middle beeper
* Post-condition: Karel returns to middle facing North
*/
private void cleanBeepersSouth() {
turnRight();
move();
while (beepersPresent()) {
pickBeeper();
}
turnAround();
move();
}
/* Karel moves North, checks for beepers, and picks them up
* if there are any there.
* Pre-condition: Karel is in the middle of a rectangle with no
* middle beeper
* Post-condition: Karel returns to middle facing East
*/
private void cleanBeepersNorth() {
move();
if (frontIsClear()) {
move();
}
while (beepersPresent()) {
pickBeeper();
}
turnAround();
move();
turnLeft();
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment