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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 624 · 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 of these is an output? (a) checking a password (b) speaking a command (c) taking a photo (d) a pop-up message
  2. 2.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // 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 2 (b) line 3 (c) line 1 (d) line 4
  3. 3.Which of these is processing? (a) taking a photo (b) a buzz (vibration) (c) checking a password (d) tapping a button
  4. 4.Which of these is an input? (a) a result on screen (b) a beep sound (c) taking a photo (d) a pop-up message
  5. 5.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) a beep sound (d) checking a password
  6. 6.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 330; // 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 2 (b) line 1 (c) line 4 (d) line 3
  7. 7.True or false: working out a tip is an output. (a) False (b) True
  8. 8.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 440; // 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 2 (b) line 1 (c) line 4 (d) line 3
  9. 9.True or false: typing your age is an input. (a) True (b) False
  10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 140; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 2 (b) line 1 (c) line 4 (d) line 3
  11. 11.True or false: sorting the scores is processing. (a) True (b) False
  12. 12.⚙️ What number does this app show?
    let price = 200; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  13. 13.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  14. 14.True or false: a result on screen is processing. (a) True (b) False
  15. 15.True or false: adding up a bill is an input. (a) False (b) True
  16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 140; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 2 (b) line 4 (c) line 1 (d) line 3
  17. 17.True or false: a buzz (vibration) is an output. (a) True (b) False
  18. 18.True or false: speaking a command is an output. (a) False (b) True
  19. 19.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
  20. 20.⚙️ What number does this app show?
    let price = 280; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  21. 21.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) input (c) output
  22. 22.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
  23. 23.Which of these is an input? (a) adding up a bill (b) a result on screen (c) speaking a command (d) checking a password
  24. 24.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
  25. 25.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 84; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share);     (a) line 1 (b) line 3 (c) line 2 (d) line 4
  27. 27.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  28. 28.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  29. 29.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) sorting the scores (d) a result on screen
  30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 2 (d) line 1
  31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 2 (b) line 3 (c) line 4 (d) line 1
  32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 57; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share);     (a) line 1 (b) line 4 (c) line 3 (d) line 2
  33. 33.⚙️ 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
  34. 34.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
  35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 2 (b) line 1 (c) line 3
  36. 36.True or false: typing your age is an output. (a) False (b) True
  37. 37.⚙️ What number does this app show?
    let bill = 54; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  38. 38.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 2 (c) line 1
  40. 40.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) tapping a button (d) a buzz (vibration)

Answer key

  1. a pop-up message
  2. line 3
  3. checking a password
  4. taking a photo
  5. a beep sound
  6. line 3
  7. False
  8. line 3
  9. True
  10. line 3
  11. True
  12. 170
  13. 195
  14. False
  15. False
  16. line 3
  17. True
  18. False
  19. input
  20. 250
  21. processing
  22. 120
  23. speaking a command
  24. input
  25. 300
  26. line 3
  27. 60
  28. 130
  29. a result on screen
  30. line 3
  31. line 3
  32. line 3
  33. line 2
  34. output
  35. line 2
  36. False
  37. 27
  38. 285
  39. line 2
  40. a buzz (vibration)

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