This is the solution to the StoneMasonKarel problem in the online Stanford CS 106A class

StoneMason Karel Solution

/*
 * File: StoneMasonKarel.java
 * --------------------------
 * The StoneMasonKarel subclass as it appears here does nothing.
 * When you finish writing it, it should solve the "repair the quad"
 * problem from Assignment 1.  In addition to editing the program,
 * you should be sure to edit this comment so that it no longer
 * indicates that the program does nothing.
 */

import stanford.karel.*;

public class StoneMasonKarel extends SuperKarel {

	public void run () {
		while (frontIsClear()) {
			BeeperUp();
			MoveUp();
			BeeperDown();
			MoveDown();
		}
	}
	private void BeeperUp() {
		turnLeft();
		while (frontIsClear()) {
			if (noBeepersPresent()) {
			putBeeper();
			}
			move();
		}
	}
	private void BeeperDown() {
		turnRight();
		while (frontIsClear()) {
			if (noBeepersPresent()) {
			putBeeper();
			}
			move();
		}
	}
	private void MoveUp() {
		turnRight();
		for (int i=0; i<4; i++) {
			move();
		}
	}
	private void MoveDown() {
		turnLeft();
		if (frontIsClear()) {
			for (int i=0; i<4; i++) {
				move();
			}
		}
	}
}

import stanford.karel.*;

public class StoneMasonKarel extends SuperKarel {

public void run(){
while(frontIsClear()){
repairColumns();
moveToNextColumns();
}
repairColumns();
}

private void repairColumns(){

if(rightIsBlocked()){
turnLeft();
}
else {
turnRight();
}

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

private void moveToNextColumns(){
if(facingNorth()){
turnRight();
}
else {
turnLeft();}
for (int i = 0; i < 4 ; i++){
move();
}
}
}

/* Hey Check out my solution for Stone Mason Karek the robot problem */

import stanford.karel.*;

public class StoneMasonKarel extends SuperKarel {

public void run() {
	turnLeft();
	moveForward();
	turnRight();
	moveIt();
	putBeeper();
	turnRight();
	moveForward();
	turnLeft();
	moveIt();
	putBeeper();
	turnLeft();
	moveForward();
	turnRight();
	moveIt();
	turnRight();
	moveForward();
	turnLeft();

}

private void moveForward() {
	for (int i = 0; i <= 3; i++) {
		if (beepersPresent()) {
			move();
		} else {
			putBeeper();
			move();
		}
	}

}

private void moveIt() {
	for (int i = 0; i <= 3; i++) {
		move();
	}
}

}