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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 695 · 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 processing? (a) working out a tip (b) a result on screen (c) typing your age (d) tapping a button
  2. 2.⚙️ What number does this app show?
    let bill = 72; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  3. 3.⚙️ 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);
  4. 4.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 1 (c) line 3 (d) line 4
  5. 5.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) working out a tip (d) taking a photo
  6. 6.🔍 Which is the odd one out? (a) speaking a command (b) a buzz (vibration) (c) taking a photo (d) typing your age
  7. 7.🔍 Which is the odd one out? (a) speaking a command (b) tapping a button (c) a beep sound (d) typing your age
  8. 8.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
  9. 9.⚙️ What number does this app show?
    let price = 340; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  10. 10.True or false: a result on screen is an input. (a) True (b) False
  11. 11.Which of these is an output? (a) tapping a button (b) a beep sound (c) checking a password (d) working out a tip
  12. 12.⚙️ 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 1 (b) line 2 (c) line 3
  13. 13.🔍 Which is the odd one out? (a) a pop-up message (b) tapping a button (c) a result on screen (d) a beep sound
  14. 14.⚙️ What number does this app show?
    let bill = 106; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  15. 15.⚙️ 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);
  16. 16.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
  17. 17.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
  18. 18.True or false: tapping a button is an input. (a) True (b) False
  19. 19.Which of these is processing? (a) taking a photo (b) a beep sound (c) sorting the scores (d) tapping a button
  20. 20.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 55; // 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
  21. 21.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
  22. 22.Which of these is an input? (a) sorting the scores (b) speaking a command (c) a pop-up message (d) checking a password
  23. 23.⚙️ 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 2 (c) line 1
  24. 24.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) output (c) processing
  25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 570; // 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 4 (c) line 3 (d) line 2
  26. 26.⚙️ 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);
  27. 27.⚙️ 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);
  28. 28.⚙️ 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 3 (c) line 2
  29. 29.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
  30. 30.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  31. 31.True or false: a buzz (vibration) is an output. (a) False (b) True
  32. 32.🔍 Which is the odd one out? (a) working out a tip (b) checking a password (c) adding up a bill (d) taking a photo
  33. 33.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 50; // 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 4 (b) line 2 (c) line 3 (d) line 1
  35. 35.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  36. 36.⚙️ What number does this app show?
    let bill = 108; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  37. 37.⚙️ What number does this app show?
    let price = 360; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  38. 38.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) output (c) input
  39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 290; // 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 3 (b) line 1 (c) line 2 (d) line 4
  40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 3 (b) line 1 (c) line 4 (d) line 2

Answer key

  1. working out a tip
  2. 18
  3. 20
  4. line 3
  5. working out a tip
  6. a buzz (vibration)
  7. a beep sound
  8. input
  9. 320
  10. False
  11. a beep sound
  12. line 2
  13. tapping a button
  14. 53
  15. 140
  16. output
  17. processing
  18. True
  19. sorting the scores
  20. line 3
  21. 4000
  22. speaking a command
  23. line 2
  24. processing
  25. line 3
  26. 510
  27. 540
  28. line 2
  29. input
  30. 180
  31. True
  32. taking a photo
  33. 45
  34. line 3
  35. 250
  36. 54
  37. 340
  38. output
  39. line 3
  40. line 3

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