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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 450 · 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.True or false: typing your age is an input. (a) False (b) True
  2. 2.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total);     (a) line 1 (b) line 3 (c) line 2 (d) line 4
  3. 3.True or false: a result on screen is an output. (a) False (b) True
  4. 4.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
  5. 5.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
  6. 6.⚙️ What number does this app show?
    let bill = 290; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  7. 7.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
  8. 8.Which of these is processing? (a) sorting the scores (b) typing your age (c) a buzz (vibration) (d) tapping a button
  9. 9.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 225; // 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
  10. 10.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) sorting the scores (d) a beep sound
  11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 530; // 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 1 (b) line 4 (c) line 2 (d) line 3
  12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 1 (b) line 2 (c) line 3
  13. 13.⚙️ 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 1 (b) line 2 (c) line 4 (d) line 3
  14. 14.Which of these is an output? (a) taking a photo (b) speaking a command (c) adding up a bill (d) a result on screen
  15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 2 (b) line 4 (c) line 1 (d) line 3
  16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 75; // typed by the user
    line 2: let qty = 2; // 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
  17. 17.True or false: sorting the scores is processing. (a) False (b) True
  18. 18.True or false: a buzz (vibration) is an output. (a) True (b) False
  19. 19.⚙️ 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 1 (b) line 2 (c) line 3 (d) line 4
  20. 20.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
  21. 21.⚙️ What number does this app show?
    let price = 370; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  22. 22.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
  23. 23.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
  24. 24.⚙️ In an app, is working out a tip an input, processing or an output? (a) processing (b) output (c) input
  25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 350; // 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 3 (c) line 1 (d) line 4
  26. 26.True or false: a pop-up message is an output. (a) False (b) True
  27. 27.True or false: adding up a bill is processing. (a) False (b) True
  28. 28.⚙️ What number does this app show?
    let bill = 100; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  29. 29.🔍 Which is the odd one out? (a) typing your age (b) adding up a bill (c) speaking a command (d) tapping a button
  30. 30.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
  31. 31.⚙️ What number does this app show?
    let price = 540; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  32. 32.True or false: checking a password is an input. (a) True (b) False
  33. 33.Which of these is an input? (a) a buzz (vibration) (b) sorting the scores (c) a beep sound (d) taking a photo
  34. 34.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 146; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share);     (a) line 3 (b) line 1 (c) line 4 (d) line 2
  36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 320; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share);     (a) line 2 (b) line 4 (c) line 1 (d) line 3
  37. 37.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 1 (b) line 4 (c) line 3 (d) line 2
  39. 39.⚙️ What number does this app show?
    let km = 15; // typed by the user
    let metres = km * 1000;
    show(metres);
  40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 130; // 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 2 (b) line 4 (c) line 1 (d) line 3

Answer key

  1. True
  2. line 3
  3. True
  4. 425
  5. input
  6. 58
  7. processing
  8. sorting the scores
  9. line 3
  10. sorting the scores
  11. line 3
  12. line 2
  13. line 3
  14. a result on screen
  15. line 3
  16. line 3
  17. True
  18. True
  19. line 3
  20. 10000
  21. 340
  22. processing
  23. output
  24. processing
  25. line 3
  26. True
  27. True
  28. 25
  29. adding up a bill
  30. processing
  31. 510
  32. False
  33. taking a photo
  34. 510
  35. line 3
  36. line 3
  37. 130
  38. line 3
  39. 15000
  40. line 3

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