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Draw the path of the robot through the grid below if the following program is executed (the robot starts in the square marked by the ↑ facing in the direction of the arrow) - AQA - GCSE Computer Science - Question 9 - 2021 - Paper 1
Question 9
Draw the path of the robot through the grid below if the following program is executed (the robot starts in the square marked by the ↑ facing in the direction of the... show full transcript
Worked Solution & Example Answer:Draw the path of the robot through the grid below if the following program is executed (the robot starts in the square marked by the ↑ facing in the direction of the arrow) - AQA - GCSE Computer Science - Question 9 - 2021 - Paper 1
Step 1
Draw the path of the robot through the grid below if the following program is executed (the robot starts in the square marked by the ↑ facing in the direction of the arrow).
Answer
- Initial Position: The robot starts at the square denoted by the ↑, facing upwards.
- Execute
Forward(2): The robot moves up 2 squares:- From (1, 1) to (0, 1) then to moving beyond the grid limit at (-1, 1). The path is drawn up to (0, 1).
- Execute
TurnLeft(): The robot turns left to face west. - Execute
Forward(1): The robot moves left to (0, 0). - Execute
TurnRight(): The robot turns right to face north again. - Execute
Forward(1): The robot moves back up to (1, 0).
Final Path:
- The path on the grid can be depicted as follows:
1 . . . . .
. . . . .
→ . . . .
Where the robot's journey is marked on the grid.
Step 2
Draw the path of the robot through the grid below if the following program is executed (the robot starts in the square marked by the ↑ facing in the direction of the arrow). If a square is black then it contains an object.
Answer
- Initial Position: The robot starts at the square denoted by the ↑. Let's assume the position coordinates (1, 1).
- Execute
WHILE ObjectAhead() = true: Start the loop if there is an object straight ahead (upward). - Execute
TurnLeft(): If there is an object ahead, the robot turns left (now facing west). - Execute
IF ObjectAhead() = true THEN: Check if there is an object ahead:- If yes, it then executes
TurnRight()(turns from west to north). - It executes another
TurnRight()(now facing east).
- If yes, it then executes
- Execute
ENDIF: Finalizing conditions and actions. - Execute
Forward(1): Moves to the east (if open). - Execute
ENDWHILE: Returns to checking condition for the loop again. - Execute
Forward(1): Finally, moves one square forward.
Final Path:
- The path on the grid can be depicted as follows:
. . . . .
. . X . .
. . ↑ . .
Where 'X' denotes a square with an object the robot encounters.