Robotics Worksheet: Debugging Robot Programs

Robotics lesson 26: Debugging robot programs · Set 102 · 40 questions

Robot tip (Compare and fix one thing): Run it, spot what went wrong, find the buggy line, fix one thing, test again. Wrong side → a turn is the wrong way. Too far or too short → a forward number is wrong. A shape that does not close → the turn should be 360 ÷ sides; a gap → the repeat number should equal the sides.

1. 1.🐞 This program should draw a regular square (4 equal sides), but it leaves a gap:
   repeat 2 { forward 10 cm; turn right 90° }
   What should the number 2 after “repeat” be?
2. 2.🐞 This program should draw a regular square (4 equal sides), but the shape does not close:
   repeat 4 { forward 10 cm; turn right 72° }
   What should 72 be changed to?
3. 3.🐞 A robot starts at (4, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (5, 4). Its program:
   1. forward 3
   2. turn right
   3. forward 1
   It stops at (5, 5) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1
4. 4.🐞 A robot starts at (5, 1) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (8, 6). Its program:
   1. forward 5
   2. turn left
   3. forward 3
   It stops at (2, 6) instead. Which line has the bug? (a) line 1 (b) line 3 (c) line 2
5. 5.🐞 A robot starts at (4, 1) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (1, 6). Its program:
   1. forward 5
   2. turn left
   3. forward 2
   It stops at (2, 6) instead. Which line has the bug? (a) line 1 (b) line 2 (c) line 3
6. 6.🐞 This program should draw a regular hexagon (6 equal sides), but the shape does not close:
   repeat 6 { forward 10 cm; turn right 72° }
   What should 72 be changed to?
7. 7.🔢 To debug a robot program, which comes first: “test it again” or “find the buggy line”? (a) find the buggy line (b) test it again
8. 8.🐞 A robot starts at (5, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (2, 8). Its program:
   1. forward 6
   2. turn left
   3. forward 2
   It stops at (3, 8) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1
9. 9.🔢 To debug a robot program, which comes first: “run the program” or “test it again”? (a) run the program (b) test it again
10. 10.🐞 A robot starts at (5, 1) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (8, 7). Its program:
    1. forward 6
    2. turn right
    3. forward 2
    It stops at (7, 7) instead. Which line has the bug? (a) line 1 (b) line 3 (c) line 2
11. 11.🐞 This program should draw a regular triangle (3 equal sides), but it leaves a gap:
    repeat 2 { forward 10 cm; turn right 120° }
    What should the number 2 after “repeat” be?
12. 12.🐞 This program should draw a regular square (4 equal sides), but the shape does not close:
    repeat 4 { forward 10 cm; turn right 45° }
    What should 45 be changed to?
13. 13.🐞 A mistake in a program is called a … (a) bug (b) gear (c) sensor (d) loop
14. 14.🔢 To debug a robot program, which comes first: “fix one thing” or “run the program”? (a) run the program (b) fix one thing
15. 15.🐞 A robot starts at (4, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (6, 4). Its program:
    1. forward 3
    2. turn right
    3. forward 2
    It stops at (6, 5) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
16. 16.🐞 A robot starts at (5, 0) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (2, 3). Its program:
    1. forward 3
    2. turn right
    3. forward 3
    It stops at (8, 3) instead. Which line has the bug? (a) line 3 (b) line 1 (c) line 2
17. 17.🐞 A robot starts at (5, 1) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (4, 6). Its program:
    1. forward 5
    2. turn left
    3. forward 2
    It stops at (3, 6) instead. Which line has the bug? (a) line 2 (b) line 1 (c) line 3
18. 18.🔢 To debug a robot program, which is the FIRST step? (a) find the buggy line (b) run the program (c) fix one thing (d) spot what went wrong
19. 19.🐞 A robot starts at (4, 0) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (5, 5). Its program:
    1. forward 5
    2. turn right
    3. forward 2
    It stops at (6, 5) instead. Which line has the bug? (a) line 2 (b) line 1 (c) line 3
20. 20.🔢 To debug a robot program, which is the LAST step? (a) run the program (b) find the buggy line (c) test it again (d) spot what went wrong
21. 21.🐞 A robot starts at (5, 0) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (4, 3). Its program:
    1. forward 3
    2. turn left
    3. forward 2
    It stops at (3, 3) instead. Which line has the bug? (a) line 3 (b) line 1 (c) line 2
22. 22.🔢 To debug a robot program, what comes right after “spot what went wrong”? (a) test it again (b) fix one thing (c) run the program (d) find the buggy line
23. 23.🐞 A robot starts at (5, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (4, 8). Its program:
    1. forward 6
    2. turn left
    3. forward 2
    It stops at (3, 8) instead. Which line has the bug? (a) line 2 (b) line 1 (c) line 3
24. 24.🐞 This program should draw a regular octagon (8 equal sides), but it leaves a gap:
    repeat 7 { forward 10 cm; turn right 45° }
    What should the number 7 after “repeat” be?
25. 25.🐞 A robot starts at (4, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (6, 5). Its program:
    1. forward 3
    2. turn left
    3. forward 2
    It stops at (2, 5) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
26. 26.🐞 A robot starts at (4, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (6, 6). Its program:
    1. forward 4
    2. turn left
    3. forward 2
    It stops at (2, 6) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1
27. 27.🐞 Why change only one thing at a time when debugging? (a) to see what fixed it (b) to confuse others (c) to save paper (d) to make it slower
28. 28.🐞 This program should draw a regular hexagon (6 equal sides), but it leaves a gap:
    repeat 2 { forward 10 cm; turn right 60° }
    What should the number 2 after “repeat” be?
29. 29.🐞 This program should draw a regular pentagon (5 equal sides), but the shape does not close:
    repeat 5 { forward 10 cm; turn right 60° }
    What should 60 be changed to?
30. 30.🐞 This program should draw a regular octagon (8 equal sides), but it leaves a gap:
    repeat 6 { forward 10 cm; turn right 45° }
    What should the number 6 after “repeat” be?
31. 31.🐞 This program should draw a regular octagon (8 equal sides), but it leaves a gap:
    repeat 4 { forward 10 cm; turn right 45° }
    What should the number 4 after “repeat” be?
32. 32.🐞 A robot starts at (4, 1) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (7, 4). Its program:
    1. forward 3
    2. turn left
    3. forward 3
    It stops at (1, 4) instead. Which line has the bug? (a) line 1 (b) line 2 (c) line 3
33. 33.🐞 A robot turns the wrong way at every corner. What is the likely bug? (a) left and right mixed up (b) wheels are too round (c) the floor is clean (d) battery is too new
34. 34.🐞 This program should draw a regular pentagon (5 equal sides), but it leaves a gap:
    repeat 4 { forward 10 cm; turn right 72° }
    What should the number 4 after “repeat” be?
35. 35.🐞 A robot starts at (5, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (4, 6). Its program:
    1. forward 4
    2. turn left
    3. forward 2
    It stops at (3, 6) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1
36. 36.🐞 A robot starts at (5, 0) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (8, 4). Its program:
    1. forward 3
    2. turn right
    3. forward 3
    It stops at (8, 3) instead. Which line has the bug? (a) line 2 (b) line 1 (c) line 3
37. 37.🔢 To debug a robot program, which comes first: “spot what went wrong” or “test it again”? (a) spot what went wrong (b) test it again
38. 38.🐞 This program should draw a regular triangle (3 equal sides), but the shape does not close:
    repeat 3 { forward 10 cm; turn right 72° }
    What should 72 be changed to?
39. 39.🐞 A robot starts at (4, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (6, 6). Its program:
    1. forward 4
    2. turn right
    3. forward 1
    It stops at (5, 6) instead. Which line has the bug? (a) line 1 (b) line 2 (c) line 3
40. 40.🐞 A robot starts at (4, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (5, 8). Its program:
    1. forward 6
    2. turn left
    3. forward 1
    It stops at (3, 8) instead. Which line has the bug? (a) line 1 (b) line 2 (c) line 3

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