def main(): go_to_origin() gen_reference_row() to_face_north() while front_is_clear(): if beepers_present(): move_to_next_row() if front_is_clear(): move() gen_reference_row() else: move_to_next_row() gen_reference_row() to_face_north()
After finishing a row, Karel must move up one row and face the opposite direction. The "Offset" Problem:
Create two separate transition functions based on Karel's orientation and the presence of a beeper.
Checkerboard Karel | Learn to Code Episode 4 by Tiffany Arielle 645 checkerboard karel answer verified
Always test your code on the 1x1 world and the 8x2 world in CodeHS to ensure your solution is truly universal!
What or unexpected behavior is CodeHS displaying? The exact dimensions of the grid where your code fails. Share public link
: If the front is still clear, move a second step and put_beeper() . What or unexpected behavior is CodeHS displaying
else if (facingNorth()) if (rightIsBlocked()) if (leftIsClear()) turnLeft();
void fillRow() // move across row, placing beepers on alternate squares while (frontIsClear()) move(); if (!beepersPresent()) // place only on every other square: check previous square to alternate // Simpler: attempt to move two steps placing beepers on stepping pattern
: This is the trickiest part. If a row ends on a beeper, the next row must start with an empty space (and vice versa) to maintain the pattern. Step-by-Step Code Guide 1. The start Function breaking the main goal into smaller
This is where you’ll use , breaking the main goal into smaller, manageable functions. A good solution typically includes functions like:
// Move to the next row if (i < size - 1) turnLeft(); move(size); turnRight();
private void moveUpAndReverse() turnLeft(); move(); turnLeft(); // Now Karel is facing opposite direction (West if was East, etc.)