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Four separate subroutines have been written to control a robot - AQA - GCSE Computer Science - Question 9 - 2021 - Paper 1
Question 9
Four separate subroutines have been written to control a robot. - Forward(n) moves the robot n squares forward. - TurnLeft(t) turns the robot 90 degrees left. - Tur... show full transcript
Worked Solution & Example Answer:Four separate subroutines have been written to control a robot - 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
The robot moves forward 2 squares:
- From its starting position (square with ↑), it moves to square A.
- Then it moves to square B.
The path is as follows:
- Moves from square marked ↑ to square A.
- Moves from square A to square B.
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
In this program, the robot follows a series of instructions:
- The robot checks if there is an object ahead at its starting position (square C).
- Since square C is empty, it turns left.
- It checks square A, which is also empty.
- Then, it turns right twice to face its original direction and moves forward to square C.
The path is as follows:
- Moves from square with ↑ to square A (empty).
- Moves from A to B (contains an object).
- Stops since it can't move forward.