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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 180 · 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 = 90; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  2. 2.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
  3. 3.🔍 Which is the odd one out? (a) a result on screen (b) adding up a bill (c) a beep sound (d) a pop-up message
  4. 4.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) tapping a button (d) a buzz (vibration)
  5. 5.⚙️ What number does this app show?
    let bill = 138; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
  6. 6.True or false: a beep sound is an output. (a) False (b) True
  7. 7.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 165; // 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 3 (c) line 4 (d) line 1
  8. 8.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) input (c) processing
  9. 9.⚙️ What number does this app show?
    let bill = 175; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 11; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 1 (b) line 2 (c) line 3
  11. 11.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a pop-up message (d) sorting the scores
  12. 12.⚙️ What number does this app show?
    let bill = 145; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  13. 13.Which of these is processing? (a) tapping a button (b) a pop-up message (c) a buzz (vibration) (d) sorting the scores
  14. 14.⚙️ What number does this app show?
    let price = 600; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  15. 15.True or false: taking a photo is an input. (a) True (b) False
  16. 16.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
  17. 17.⚙️ What number does this app show?
    let bill = 320; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  18. 18.⚙️ What number does this app show?
    let price = 90; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 3 (c) line 2 (d) line 4
  20. 20.🔍 Which is the odd one out? (a) working out a tip (b) a beep sound (c) checking a password (d) sorting the scores
  21. 21.🔍 Which is the odd one out? (a) a pop-up message (b) taking a photo (c) a beep sound (d) a buzz (vibration)
  22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 76; // 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 3 (b) line 1 (c) line 4 (d) line 2
  23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // 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 3 (d) line 4
  24. 24.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  25. 25.True or false: working out a tip is processing. (a) False (b) True
  26. 26.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) processing (c) output
  27. 27.True or false: tapping a button is processing. (a) False (b) True
  28. 28.Which of these is processing? (a) tapping a button (b) a buzz (vibration) (c) a result on screen (d) adding up a bill
  29. 29.True or false: adding up a bill is an output. (a) False (b) True
  30. 30.⚙️ What number does this app show?
    let bill = 45; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
  31. 31.⚙️ What number does this app show?
    let bill = 46; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  32. 32.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
  33. 33.⚙️ What number does this app show?
    let price = 480; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  34. 34.Which of these is an input? (a) a pop-up message (b) sorting the scores (c) adding up a bill (d) speaking a command
  35. 35.Which of these is an input? (a) a buzz (vibration) (b) typing your age (c) a beep sound (d) a pop-up message
  36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 48; // 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 4 (b) line 1 (c) line 3 (d) line 2
  37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 390; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share);     (a) line 2 (b) line 4 (c) line 3 (d) line 1
  38. 38.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
  39. 39.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  40. 40.True or false: typing your age is an input. (a) True (b) False

Answer key

  1. 540
  2. 2000
  3. adding up a bill
  4. tapping a button
  5. 46
  6. True
  7. line 3
  8. output
  9. 35
  10. line 2
  11. sorting the scores
  12. 29
  13. sorting the scores
  14. 590
  15. True
  16. input
  17. 64
  18. 180
  19. line 3
  20. a beep sound
  21. taking a photo
  22. line 3
  23. line 3
  24. 225
  25. True
  26. input
  27. False
  28. adding up a bill
  29. False
  30. 15
  31. 23
  32. output
  33. 460
  34. speaking a command
  35. typing your age
  36. line 3
  37. line 3
  38. 8000
  39. 240
  40. True

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