Question

Below is a block of code intended to navigate a robot through a grid of squares.

Repeat Until (can_move [right]
move_forward
[rotate_right]
[move_forward]
For which of the following grids will the code correctly navigate the robot to a final destination of the grey square and then terminate?
Option 1: To move the robot forward continuously.
Option 2: To check if the robot can move right.
Option 3: To rotate the robot to the right.
Option 4: To navigate the robot to the final destination.

Answer 1

The code is designed to move a robot through a grid by favoring right turns. It requires a grid with a layout that allows right-wall following to successfully reach a grey square. The correct grid would enable such pathfinding without getting the robot stuck or in an infinite loop.

Step-by-step explanation:

The block of code provided is intended to control a robot moving through a grid, similar to navigating a city with uniform square blocks.

The code appears to follow these rules:

• If the robot can move right, do so.
• If moving right is not possible, move forward.
• If an obstacle is encountered, rotate right and then move forward.

This logic suggests that the robot will keep hugging the right wall until it reaches its destination. Therefore, the grid that will allow this program to successfully navigate the robot to a grey square and then terminate would likely have a clear path with obstacles that force the robot to consistently turn right.

Without a visual representation of the options, we cannot specifically determine which of the presented options (To move the robot forward continuously, To check if the robot can move right, To rotate the robot to the right, To navigate the robot to the final destination) would be correct as they are partially descriptions of the actions in the code rather than grid layouts. The grid should be designed in such a way that following the wall on the right side leads the robot to the grey square.