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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
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
The robot starts at position (2,3) facing up. Following the commands:
- Forward(2): Moves to (0,3) [Square A].
- TurnLeft(): Now facing left (West).
- Forward(1): Moves to (0,2) [Square B].
- TurnRight(): Now facing up (North).
- Forward(1): Moves to (0,1) [Square C].
The path is drawn through squares A, B, and C.
Step 2
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
In this scenario, the robot starts at position (2,3):
- ObjectAhead(): The square (1,3) is empty, so the robot moves ahead.
- TurnLeft(): Now facing left (West).
- In the next iteration, ObjectAhead(): Square (1,3) is checked, robot turns left if found. As it is empty, it checks again to turn right and left subsequently.
- It will continue until the path downwards is reached getting stuck at the black squares at positions (1,3) and (2,2).
- Final movement goes down to (2,1) and then ends up at (2,0).