/*
 * File: CheckerboardKarel.java
 * ----------------------------
 * When you finish writing it, the CheckerboardKarel class should draw
 * a checkerboard using beepers, as described in Assignment 1.  You
 * should make sure that your program works for all of the sample
 * worlds supplied in the starter folder.
 */

import stanford.karel.*;

public class CheckerboardKarel extends SuperKarel {

	/* pre-condition: Karel is at the bottom left of an empty matrix
	 * post-condition: the screen has one single beeper on every other
	 * space, on odd numbered avenues for odd numbered streets,
	 * and beepers on even numbered avenues for even numbered streets.
	 */ 
	
	public void run()  {
		makeOddRow();
		makeEvenRow();
		
	}

	private void makeOddRow()  {
		putBeeper();
		while (frontIsClear())  {
			move();
			while (frontIsClear())  {
				move();
				makeOddRow();
			}
			if (leftIsClear())  {
				turnLeft();
				move();
				turnLeft();
				makeEvenRow();
			}
		
		}
		 
	}
	
	private void makeEvenRow()  {
		putBeeper();
		while (frontIsClear())  {
			move();
			while (frontIsClear())  {
				move();
				makeEvenRow();
			}
		}
		turnRight();
		if (frontIsClear())  {
			move();
			turnRight();
			makeOddRow();
		}
		
	}
	
}

//checker karel...

import stanford.karel.*;

public class CheckerboardKarel extends SuperKarel 

{
	public void run()  {
		makeOddRow();
		makeEvenRow();
		
		
	}

	private void makeOddRow()  {
		putBeeper();
		while (frontIsClear())  {
			move();
			while (frontIsClear())  {
				move();
				makeOddRow();
			}
			if (leftIsClear())  {
				turnLeft();
				move();
				turnLeft();
				makeEvenRow();
			}
		
		}
		
	}
	
	private void makeEvenRow()  {
		putBeeper();
		while (frontIsClear())  {
			move();
			while (frontIsClear())  {
				move();
				makeEvenRow();
			}
			
		}
	turnRight();
	if (frontIsClear())  {
		move();
		turnRight();
		makeOddRow();
		while (facingNorth()){
			if (frontIsBlocked()){
				stopKarel();
			}
		}
		
		}
	}

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