If you write n%10, it will always print out the last digit of the variable, or n. If you write n/10, it will print out n without the last digit.

Rows: x is 6 columns: y is 8 First, make a row that has y black tiles at the top. Once you reach the end of the row, place (x-1) black tiles as you go down. Then, put down (y-1) black tiles as you go to the left. Next, place (x-2) black tiles as you go up. For the last few step, start by going (y-4) to the right and (x-2) down. Place a black tile on your current location and the tile to the right.

1. Make bot move to the nearest corner 2. Make bot face start of line 3. Sense 4. Turn bot to the right 5. Move bot forward 1 unit 6. Turn to the left 7. Sense 8. Continue until the bot reaches end of the line 9. Turn bot 90 degrees so it is facing upwards and is on the start of the next line 10. Continue this system until the bot ends up where it started