6.4.5 Checkerboard Karel Answer High Quality (2026)

function start() putBeeper(); // Start the first beeper fillRow(); while (leftIsClear()) repositionForNextRow(); fillRow(); function fillRow() while (frontIsClear()) move(); if (frontIsClear()) move(); putBeeper(); function repositionForNextRow() if (facingEast()) turnLeft(); checkAndMoveUp(); turnLeft(); else turnRight(); checkAndMoveUp(); turnRight(); function checkAndMoveUp() if (beepersPresent()) move(); else move(); putBeeper(); Use code with caution. Copied to clipboard Python Solution

function start(): turn_off_auto_put_beeper()? No – just manual control. put_beeper() // top-left corner gets a beeper while front_is_clear(): move() if no_beepers_present(): // This cell needs a beeper if previous cell had none if beepers_present()? Wait – careful. 6.4.5 checkerboard karel answer

Check your fillRow function. Ensure there is a frontIsClear() check before every move() . function start() putBeeper(); // Start the first beeper

In standard Karel coordinate systems (1-based): put_beeper() // top-left corner gets a beeper while

/* * Method: repositionForRowChange * ------------------------------ * Moves Karel from the end of one row to the start of the next. */ private void repositionForRowChange() if (facingEast()) turnLeft(); move(); turnLeft(); else // Karel is facing West turnRight(); move(); turnRight();

function fillRow() while(frontIsClear()) move(); if(frontIsClear()) move(); putBeeper();