public class MidpointFindingKarel extends SuperKarel {

	public void run(){
				if (frontIsClear()){
				layBeepers();
				removeAllButCentreBeeper();
				}
	}

			private void layBeepers(){
						while (frontIsClear()){
								putBeeper();
								move();
						}
								putBeeper();
						if (frontIsBlocked()){
								turnAround();
						}
			}

			private void removeAllButCentreBeeper(){
						while (beepersPresent()){
								pickBeeper();
								move();
								if (beepersPresent()){
									moveToWall();
									turnAround();
									while (noBeepersPresent()){
											move();
									}
								}
						}
						turnAround();
						move();
						putBeeper();
			}

			private void moveToWall(){
						while (frontIsClear()){
								move();
						}
			}

}

/*
* File: CheckerboardKarel.java
* —————————-
* CheckerboardKarel class draws a checkerboard using beepers,
* as described in Assignment 1. Karel starts in the southwest
* corner of the world, facing east. Program works for various worlds.
*/

import stanford.karel.*;

public class CheckerboardKarel extends SuperKarel {
public void run() {

putBeeper();

if (frontIsBlocked()) {
turnLeft();
}

while (frontIsClear()) {
move();
if (frontIsClear()) {
move();
putBeeper();

if (frontIsBlocked()) {
moveToNextStreet();
if (frontIsClear()) {
move();
putBeeper();
}

}

} else {
moveToNextStreet();
if (frontIsClear()) {
putBeeper();
}
}

}
}

/**
* Moves to the next street facing opposite direction
*/
private void moveToNextStreet() {
if (facingEast()) {
turnLeft();
if (frontIsClear()) {
move();
turnLeft();
}
} else {
turnRight();
if (frontIsClear()) {
move();
turnRight();
}
}
}
}

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