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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 629 · 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.⚙️ What number does this app show?
    let price = 390; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  2. 2.True or false: adding up a bill is processing. (a) False (b) True
  3. 3.🔍 Which is the odd one out? (a) a result on screen (b) adding up a bill (c) working out a tip (d) sorting the scores
  4. 4.True or false: sorting the scores is processing. (a) True (b) False
  5. 5.True or false: typing your age is an output. (a) True (b) False
  6. 6.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // 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 3 (c) line 4 (d) line 1
  7. 7.Which of these is processing? (a) a result on screen (b) checking a password (c) a beep sound (d) a pop-up message
  8. 8.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 1 (c) line 2
  9. 9.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 216; // 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 2 (b) line 4 (c) line 1 (d) line 3
  10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // typed by the user
    line 2: let qty = 6; // 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
  11. 11.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) tapping a button (d) typing your age
  12. 12.Which of these is an input? (a) a buzz (vibration) (b) sorting the scores (c) tapping a button (d) a result on screen
  13. 13.Which of these is an input? (a) typing your age (b) a beep sound (c) adding up a bill (d) working out a tip
  14. 14.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  15. 15.True or false: working out a tip is an input. (a) True (b) False
  16. 16.True or false: taking a photo is an input. (a) False (b) True
  17. 17.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 4 (c) line 3 (d) line 2
  19. 19.⚙️ What number does this app show?
    let bill = 44; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  20. 20.True or false: tapping a button is an input. (a) False (b) True
  21. 21.Which of these is processing? (a) a buzz (vibration) (b) a beep sound (c) working out a tip (d) a pop-up message
  22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 2 (b) line 1 (c) line 3
  23. 23.True or false: tapping a button is processing. (a) True (b) False
  24. 24.⚙️ What number does this app show?
    let bill = 320; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  25. 25.⚙️ What number does this app show?
    let price = 560; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  26. 26.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  27. 27.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
  28. 28.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  29. 29.True or false: a result on screen is an input. (a) True (b) False
  30. 30.Which of these is processing? (a) a beep sound (b) typing your age (c) adding up a bill (d) tapping a button
  31. 31.True or false: tapping a button is an output. (a) True (b) False
  32. 32.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) output (c) input
  33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // typed by the user
    line 2: let qty = 5; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total);     (a) line 1 (b) line 3 (c) line 4 (d) line 2
  34. 34.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) input (c) processing
  35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 1 (c) line 2 (d) line 4
  36. 36.⚙️ 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 1 (b) line 3 (c) line 2
  37. 37.True or false: a pop-up message is processing. (a) False (b) True
  38. 38.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) output (c) input
  39. 39.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
  40. 40.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input

Answer key

  1. 380
  2. True
  3. a result on screen
  4. True
  5. False
  6. line 3
  7. checking a password
  8. line 2
  9. line 3
  10. line 3
  11. a beep sound
  12. tapping a button
  13. typing your age
  14. 100
  15. False
  16. True
  17. 60
  18. line 3
  19. 11
  20. True
  21. working out a tip
  22. line 2
  23. False
  24. 80
  25. 550
  26. 140
  27. output
  28. 90
  29. False
  30. adding up a bill
  31. False
  32. output
  33. line 3
  34. output
  35. line 3
  36. line 2
  37. False
  38. input
  39. 210
  40. input

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