Robotics Worksheet: Debugging Robot Programs

Robotics lesson 26: Debugging robot programs · Set 212 · 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 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?
2. 2.🐞 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?
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 (1, 6). Its program:
   1. forward 4
   2. turn right
   3. forward 3
   It stops at (7, 6) instead. Which line has the bug? (a) line 2 (b) line 1 (c) line 3
4. 4.🐞 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 (6, 7). Its program:
   1. forward 5
   2. turn left
   3. forward 1
   It stops at (4, 7) instead. Which line has the bug? (a) line 2 (b) line 1 (c) line 3
5. 5.🐞 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 (7, 4). Its program:
   1. forward 2
   2. turn left
   3. forward 2
   It stops at (3, 4) instead. Which line has the bug? (a) line 3 (b) line 1 (c) line 2
6. 6.🔢 To debug a robot program, what comes right after “fix one thing”? (a) test it again (b) run the program (c) find the buggy line (d) spot what went wrong
7. 7.🔢 To debug a robot program, which is the FIRST step? (a) run the program (b) find the buggy line (c) fix one thing (d) spot what went wrong
8. 8.🐞 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 (1, 7). Its program:
   1. forward 4
   2. turn left
   3. forward 3
   It stops at (1, 6) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1
9. 9.🐞 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, 4). Its program:
   1. forward 2
   2. turn left
   3. forward 2
   It stops at (3, 4) instead. Which line has the bug? (a) line 3 (b) line 1 (c) line 2
10. 10.🐞 A mistake in a program is called a … (a) sensor (b) gear (c) bug (d) loop
11. 11.🔢 To debug a robot program, which comes first: “spot what went wrong” or “test it again”? (a) test it again (b) spot what went wrong
12. 12.🐞 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 (2, 4). Its program:
    1. forward 4
    2. turn left
    3. forward 1
    It stops at (3, 4) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1
13. 13.🐞 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 (3, 7). Its program:
    1. forward 5
    2. turn left
    3. forward 2
    It stops at (3, 6) instead. Which line has the bug? (a) line 1 (b) line 3 (c) line 2
14. 14.🐞 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 (5, 4). Its program:
    1. forward 3
    2. turn left
    3. forward 1
    It stops at (3, 4) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
15. 15.🐞 This program should draw a regular pentagon (5 equal sides), but the shape does not close:
    repeat 5 { forward 10 cm; turn right 120° }
    What should 120 be changed to?
16. 16.🐞 Why change only one thing at a time when debugging? (a) to save paper (b) to confuse others (c) to see what fixed it (d) to make it slower
17. 17.🔢 To debug a robot program, which comes first: “fix one thing” or “find the buggy line”? (a) find the buggy line (b) fix one thing
18. 18.🐞 This program should draw a regular octagon (8 equal sides), but it leaves a gap:
    repeat 3 { forward 10 cm; turn right 45° }
    What should the number 3 after “repeat” be?
19. 19.🔢 To debug a robot program, what comes right after “spot what went wrong”? (a) find the buggy line (b) fix one thing (c) test it again (d) run the program
20. 20.🔢 To debug a robot program, which is the LAST step? (a) test it again (b) spot what went wrong (c) run the program (d) find the buggy line
21. 21.🐞 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 (6, 5). Its program:
    1. forward 3
    2. turn right
    3. forward 2
    It stops at (7, 5) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
22. 22.🐞 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, 3). Its program:
    1. forward 3
    2. turn left
    3. forward 1
    It stops at (3, 3) instead. Which line has the bug? (a) line 2 (b) line 1 (c) line 3
23. 23.🐞 A robot turns the wrong way at every corner. What is the likely bug? (a) wheels are too round (b) battery is too new (c) the floor is clean (d) left and right mixed up
24. 24.🔢 To debug a robot program, which comes first: “test it again” or “spot what went wrong”? (a) test it again (b) spot what went wrong
25. 25.🐞 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 (6, 2). Its program:
    1. forward 3
    2. turn right
    3. forward 1
    It stops at (6, 3) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1
26. 26.🐞 This program should draw a regular triangle (3 equal sides), but the shape does not close:
    repeat 3 { forward 10 cm; turn right 90° }
    What should 90 be changed to?
27. 27.🐞 This program should draw a regular square (4 equal sides), but the shape does not close:
    repeat 4 { forward 10 cm; turn right 120° }
    What should 120 be changed to?
28. 28.🐞 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 (7, 4). Its program:
    1. forward 4
    2. turn left
    3. forward 3
    It stops at (1, 4) instead. Which line has the bug? (a) line 1 (b) line 3 (c) line 2
29. 29.🔢 To debug a robot program, which comes first: “test it again” or “run the program”? (a) test it again (b) run the program
30. 30.🔢 To debug a robot program, which comes first: “run the program” or “spot what went wrong”? (a) spot what went wrong (b) run the program
31. 31.🐞 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 (7, 5). Its program:
    1. forward 3
    2. turn right
    3. forward 4
    It stops at (8, 5) instead. Which line has the bug? (a) line 1 (b) line 3 (c) line 2
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 (6, 3). Its program:
    1. forward 3
    2. turn right
    3. forward 2
    It stops at (6, 4) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
33. 33.🐞 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, 2). 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
34. 34.🐞 This program should draw a regular square (4 equal sides), but it leaves a gap:
    repeat 3 { forward 10 cm; turn right 90° }
    What should the number 3 after “repeat” be?
35. 35.🔢 To debug a robot program, what comes right after “find the buggy line”? (a) run the program (b) test it again (c) spot what went wrong (d) fix one thing
36. 36.🔢 To debug a robot program, which comes first: “spot what went wrong” or “fix one thing”? (a) fix one thing (b) spot what went wrong
37. 37.🐞 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 (1, 6). Its program:
    1. forward 4
    2. turn left
    3. forward 4
    It stops at (0, 6) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
38. 38.🐞 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 3 (b) line 2 (c) line 1
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 (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 3 (b) line 1 (c) line 2
40. 40.🐞 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 (3, 2). Its program:
    1. forward 3
    2. turn left
    3. forward 1
    It stops at (3, 3) instead. Which line has the bug? (a) line 2 (b) line 1 (c) line 3

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