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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 848 · 40 questions
TalentJR

Developer's tip (In, work, out): Input → processing → output. Input: typing, tapping, a photo, your voice. Output: a result on screen, a sound, a buzz, a pop-up. In code, the processing line works out a new value from the inputs; show() is the output.

NameDateTime takenScore ___ / 40
  1. 1.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 1 (b) line 2 (c) line 3
  2. 2.⚙️ What number does this app show?
    let bill = 75; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
  3. 3.Which of these is an input? (a) checking a password (b) a result on screen (c) tapping a button (d) a buzz (vibration)
  4. 4.⚙️ What number does this app show?
    let bill = 172; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  5. 5.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) input (c) output
  6. 6.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 1 (b) line 2 (c) line 3
  7. 7.⚙️ What number does this app show?
    let price = 420; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  8. 8.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
  9. 9.🔍 Which is the odd one out? (a) taking a photo (b) checking a password (c) typing your age (d) tapping a button
  10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 2 (b) line 1 (c) line 3
  11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total);     (a) line 1 (b) line 2 (c) line 4 (d) line 3
  12. 12.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) tapping a button (d) working out a tip
  13. 13.True or false: tapping a button is an output. (a) False (b) True
  14. 14.True or false: typing your age is processing. (a) True (b) False
  15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 190; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 3 (b) line 1 (c) line 2 (d) line 4
  16. 16.⚙️ What number does this app show?
    let km = 14; // typed by the user
    let metres = km * 1000;
    show(metres);
  17. 17.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) output (c) processing
  18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 540; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 4 (b) line 3 (c) line 1 (d) line 2
  19. 19.⚙️ What number does this app show?
    let bill = 272; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  20. 20.True or false: adding up a bill is an input. (a) True (b) False
  21. 21.True or false: taking a photo is an input. (a) True (b) False
  22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 400; // typed by the user
    line 2: let off = 30; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 1 (b) line 2 (c) line 4 (d) line 3
  23. 23.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) typing your age (d) a pop-up message
  24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 5; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 1 (c) line 2
  25. 25.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
  26. 26.⚙️ What number does this app show?
    let km = 6; // typed by the user
    let metres = km * 1000;
    show(metres);
  27. 27.True or false: speaking a command is an input. (a) True (b) False
  28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // typed by the user
    line 2: let qty = 3; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total);     (a) line 3 (b) line 4 (c) line 1 (d) line 2
  29. 29.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
  30. 30.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) working out a tip (d) a beep sound
  31. 31.Which of these is an input? (a) adding up a bill (b) a beep sound (c) a buzz (vibration) (d) typing your age
  32. 32.True or false: checking a password is an output. (a) True (b) False
  33. 33.⚙️ What number does this app show?
    let bill = 36; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  34. 34.True or false: tapping a button is an input. (a) False (b) True
  35. 35.⚙️ What number does this app show?
    let bill = 38; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  36. 36.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  37. 37.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) speaking a command (d) a result on screen
  38. 38.True or false: tapping a button is processing. (a) True (b) False
  39. 39.⚙️ What number does this app show?
    let price = 300; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  40. 40.🔍 Which is the odd one out? (a) sorting the scores (b) working out a tip (c) checking a password (d) tapping a button

Answer key

  1. line 2
  2. 25
  3. tapping a button
  4. 43
  5. processing
  6. line 2
  7. 400
  8. 2000
  9. checking a password
  10. line 2
  11. line 3
  12. working out a tip
  13. False
  14. False
  15. line 3
  16. 14000
  17. processing
  18. line 3
  19. 68
  20. False
  21. True
  22. line 3
  23. typing your age
  24. line 2
  25. input
  26. 6000
  27. True
  28. line 3
  29. 240
  30. a beep sound
  31. typing your age
  32. False
  33. 18
  34. True
  35. 19
  36. 20
  37. speaking a command
  38. False
  39. 270
  40. tapping a button

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