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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 398 · 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 line does the processing (works out the answer)?
    line 1: let bill = 134; // 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 4 (c) line 3 (d) line 1
  2. 2.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
  3. 3.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
  4. 4.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 40; // typed by the user
    let pay = price - off;
    show(pay);
  5. 5.True or false: tapping a button is processing. (a) True (b) False
  6. 6.⚙️ 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 3 (c) line 2
  7. 7.True or false: sorting the scores is an input. (a) False (b) True
  8. 8.🔍 Which is the odd one out? (a) adding up a bill (b) a beep sound (c) a result on screen (d) a pop-up message
  9. 9.True or false: a buzz (vibration) is an output. (a) True (b) False
  10. 10.⚙️ 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);
  11. 11.True or false: adding up a bill is processing. (a) False (b) True
  12. 12.True or false: a beep sound is processing. (a) False (b) True
  13. 13.True or false: a pop-up message is an output. (a) False (b) True
  14. 14.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
  15. 15.🔍 Which is the odd one out? (a) taking a photo (b) speaking a command (c) working out a tip (d) typing your age
  16. 16.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) speaking a command (d) a buzz (vibration)
  17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 50; // 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 1 (b) line 2 (c) line 4 (d) line 3
  18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 92; // 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
  19. 19.⚙️ What number does this app show?
    let km = 3; // typed by the user
    let metres = km * 1000;
    show(metres);
  20. 20.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) speaking a command (d) a beep sound
  21. 21.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  22. 22.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  23. 23.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
  24. 24.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) taking a photo (d) typing your age
  25. 25.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) checking a password (d) taking a photo
  26. 26.Which of these is processing? (a) a buzz (vibration) (b) adding up a bill (c) speaking a command (d) taking a photo
  27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // 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
  28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 4; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 1 (c) line 2
  29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 580; // 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 4 (d) line 1
  30. 30.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 4; // 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 = 15; // 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 4 (b) line 1 (c) line 2 (d) line 3
  32. 32.⚙️ What number does this app show?
    let price = 420; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
  33. 33.⚙️ What number does this app show?
    let price = 270; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  34. 34.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 460; // 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 1 (c) line 4 (d) line 3
  35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 4 (c) line 2 (d) line 3
  36. 36.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
  37. 37.True or false: a result on screen is an input. (a) False (b) True
  38. 38.⚙️ What number does this app show?
    let price = 330; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  39. 39.Which of these is an input? (a) speaking a command (b) adding up a bill (c) sorting the scores (d) a beep sound
  40. 40.⚙️ What number does this app show?
    let price = 35; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);

Answer key

  1. line 3
  2. processing
  3. processing
  4. 90
  5. False
  6. line 2
  7. False
  8. adding up a bill
  9. True
  10. 550
  11. True
  12. False
  13. True
  14. 8000
  15. working out a tip
  16. speaking a command
  17. line 3
  18. line 3
  19. 3000
  20. a beep sound
  21. 170
  22. 300
  23. 280
  24. a result on screen
  25. taking a photo
  26. adding up a bill
  27. line 3
  28. line 2
  29. line 3
  30. 140
  31. line 3
  32. 370
  33. 250
  34. line 3
  35. line 3
  36. output
  37. False
  38. 320
  39. speaking a command
  40. 175

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