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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 88 · 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) typing your age (b) tapping a button (c) taking a photo (d) a pop-up message
  2. 2.🔍 Which is the odd one out? (a) adding up a bill (b) working out a tip (c) checking a password (d) typing your age
  3. 3.🔍 Which is the odd one out? (a) adding up a bill (b) a result on screen (c) checking a password (d) sorting the scores
  4. 4.True or false: tapping a button is processing. (a) False (b) True
  5. 5.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
  6. 6.🔍 Which is the odd one out? (a) a buzz (vibration) (b) taking a photo (c) speaking a command (d) tapping a button
  7. 7.True or false: sorting the scores is an output. (a) True (b) False
  8. 8.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 450; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 4 (b) line 2 (c) line 1 (d) line 3
  9. 9.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) output (c) input
  10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 500; // 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 4 (b) line 2 (c) line 3 (d) line 1
  11. 11.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
  12. 12.Which of these is an output? (a) typing your age (b) a beep sound (c) working out a tip (d) adding up a bill
  13. 13.Which of these is an input? (a) speaking a command (b) working out a tip (c) a result on screen (d) a beep sound
  14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 95; // 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 4 (b) line 1 (c) line 2 (d) line 3
  15. 15.Which of these is an input? (a) sorting the scores (b) adding up a bill (c) tapping a button (d) working out a tip
  16. 16.True or false: checking a password is an output. (a) True (b) False
  17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 480; // 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
  18. 18.⚙️ What number does this app show?
    let price = 320; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
  19. 19.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
  20. 20.⚙️ 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 4 (b) line 3 (c) line 1 (d) line 2
  21. 21.True or false: a buzz (vibration) is an input. (a) False (b) True
  22. 22.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  23. 23.Which of these is an input? (a) typing your age (b) a buzz (vibration) (c) checking a password (d) a pop-up message
  24. 24.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) a buzz (vibration) (d) a pop-up message
  25. 25.True or false: working out a tip is processing. (a) False (b) True
  26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 150; // 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 4 (b) line 3 (c) line 2 (d) line 1
  27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 170; // 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 1 (b) line 4 (c) line 2 (d) line 3
  28. 28.🔍 Which is the odd one out? (a) taking a photo (b) tapping a button (c) speaking a command (d) adding up a bill
  29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 58; // 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 4 (b) line 1 (c) line 3 (d) line 2
  30. 30.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  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 1 (b) line 4 (c) line 2 (d) line 3
  32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 115; // 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 1 (b) line 3 (c) line 2 (d) line 4
  33. 33.True or false: tapping a button is an input. (a) True (b) False
  34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 2 (c) line 4 (d) line 3
  35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 88; // 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 1 (c) line 3 (d) line 4
  36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 110; // 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 2 (b) line 1 (c) line 3 (d) line 4
  37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 390; // typed by the user
    line 2: let off = 50; // 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
  38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 510; // 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 4 (c) line 2 (d) line 1
  39. 39.⚙️ What number does this app show?
    let price = 120; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 240; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 1 (b) line 3 (c) line 4 (d) line 2

Answer key

  1. a pop-up message
  2. typing your age
  3. a result on screen
  4. False
  5. 12000
  6. a buzz (vibration)
  7. False
  8. line 3
  9. output
  10. line 3
  11. 400
  12. a beep sound
  13. speaking a command
  14. line 3
  15. tapping a button
  16. False
  17. line 3
  18. 270
  19. output
  20. line 3
  21. False
  22. 170
  23. typing your age
  24. taking a photo
  25. True
  26. line 3
  27. line 3
  28. adding up a bill
  29. line 3
  30. 390
  31. line 3
  32. line 3
  33. True
  34. line 3
  35. line 3
  36. line 3
  37. line 3
  38. line 3
  39. 90
  40. line 3

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