Exercise 8: Drawing a Square with second tasks

Drawing a Square with second tasks

Perfect, we can do what we wanted: build the square!

Define a procedure DrawBlackSquareSide3 which, using DrawBlackLine3, draws a black square on the board.

GBB/1.0 size 3 3 cell 0 0 Negro 1 cell 0 1 Negro 1 cell 0 2 Negro 1 cell 1 0 Negro 1 cell 1 1 Negro 1 cell 1 2 Negro 1 cell 2 0 Negro 1 cell 2 1 Negro 1 cell 2 2 Negro 1 head 0 2

Give me a hint!

Remember what we said some exercises before: we can imagine a 3x3 square like 3 lines of length 3 one on top of the other, can't we? Oh! Also, remember that DrawBlackLine3 already uses ComeBack when it finishes.

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