What does the command sequence 'move(); turnLeft(); move();' do?

What does the command sequence 'move(); turnLeft(); move();' do?

• A. Moves Karel in a straight line
• B. Moves Karel forward, turns left, then moves forward again
• C. Moves Karel backward, turns right, then moves forward
• D. Moves Karel in a circle

Answer: (B)

The command sequence 'move(); turnLeft(); move();' instructs Karel to first move forward one step, then turn left, and finally move forward again. To break it down: 1. The first command, 'move()', directs Karel to advance one unit in the direction it is currently facing. This is effectively moving Karel straight ahead from its starting position. 2. The second command, 'turnLeft()', causes Karel to rotate 90 degrees to its left. After this command, Karel is now facing a new direction, perpendicular to its original path. 3. The final command, again 'move()', tells Karel to move forward in this new direction that it has just turned to. As a result, Karel's movement consists of an initial advance followed by a turn left and another advance, which means it successfully moves in a sequence that combines both a straight movement and a change in direction before the next movement. This is why the choice indicating Karel moves forward, turns left, and moves forward again aligns perfectly with the execution of the command sequence.

The command sequence 'move(); turnLeft(); move();' instructs Karel to first move forward one step, then turn left, and finally move forward again.

To break it down:

1. The first command, 'move()', directs Karel to advance one unit in the direction it is currently facing. This is effectively moving Karel straight ahead from its starting position.

2. The second command, 'turnLeft()', causes Karel to rotate 90 degrees to its left. After this command, Karel is now facing a new direction, perpendicular to its original path.

3. The final command, again 'move()', tells Karel to move forward in this new direction that it has just turned to.

As a result, Karel's movement consists of an initial advance followed by a turn left and another advance, which means it successfully moves in a sequence that combines both a straight movement and a change in direction before the next movement. This is why the choice indicating Karel moves forward, turns left, and moves forward again aligns perfectly with the execution of the command sequence.