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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 701 · 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 input? (a) a beep sound (b) adding up a bill (c) speaking a command (d) working out a tip
  2. 2.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  3. 3.True or false: speaking a command is an input. (a) True (b) False
  4. 4.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) speaking a command (d) a buzz (vibration)
  5. 5.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  6. 6.⚙️ What number does this app show?
    let price = 350; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  7. 7.True or false: a buzz (vibration) is an output. (a) True (b) False
  8. 8.🔍 Which is the odd one out? (a) sorting the scores (b) adding up a bill (c) working out a tip (d) tapping a button
  9. 9.⚙️ 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 2 (b) line 4 (c) line 1 (d) line 3
  10. 10.🔍 Which is the odd one out? (a) taking a photo (b) adding up a bill (c) checking a password (d) sorting the scores
  11. 11.Which of these is an input? (a) adding up a bill (b) a buzz (vibration) (c) taking a photo (d) a beep sound
  12. 12.⚙️ 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 3 (b) line 2 (c) line 1
  13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 2 (c) line 4 (d) line 1
  14. 14.🔍 Which is the odd one out? (a) tapping a button (b) a pop-up message (c) speaking a command (d) taking a photo
  15. 15.True or false: tapping a button is processing. (a) True (b) False
  16. 16.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
  17. 17.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) a result on screen (d) adding up a bill
  18. 18.True or false: a result on screen is an input. (a) True (b) False
  19. 19.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) processing (c) output
  20. 20.⚙️ 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 3 (c) line 1
  21. 21.Which of these is an input? (a) adding up a bill (b) tapping a button (c) checking a password (d) a beep sound
  22. 22.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 140; // 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 1 (d) line 3
  23. 23.⚙️ 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 4 (b) line 1 (c) line 2 (d) line 3
  24. 24.⚙️ What number does this app show?
    let price = 180; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  25. 25.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
  26. 26.⚙️ What number does this app show?
    let bill = 158; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  27. 27.Which of these is an output? (a) typing your age (b) working out a tip (c) tapping a button (d) a pop-up message
  28. 28.⚙️ 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 3 (b) line 1 (c) line 2
  29. 29.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
  30. 30.🔍 Which is the odd one out? (a) taking a photo (b) a beep sound (c) tapping a button (d) typing your age
  31. 31.True or false: sorting the scores is an input. (a) True (b) False
  32. 32.⚙️ In an app, is a pop-up message 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 = 270; // 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 3 (b) line 4 (c) line 2 (d) line 1
  34. 34.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // 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 2 (b) line 4 (c) line 1 (d) line 3
  36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 12; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 1 (c) line 2
  37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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
  38. 38.⚙️ 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 1 (b) line 3 (c) line 2
  39. 39.True or false: adding up a bill is processing. (a) True (b) False
  40. 40.⚙️ 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

Answer key

  1. speaking a command
  2. 480
  3. True
  4. speaking a command
  5. 150
  6. 340
  7. True
  8. tapping a button
  9. line 3
  10. taking a photo
  11. taking a photo
  12. line 2
  13. line 3
  14. a pop-up message
  15. False
  16. processing
  17. a result on screen
  18. False
  19. input
  20. line 2
  21. tapping a button
  22. line 3
  23. line 3
  24. 160
  25. 150
  26. 79
  27. a pop-up message
  28. line 2
  29. 12000
  30. a beep sound
  31. False
  32. output
  33. line 3
  34. 150
  35. line 3
  36. line 2
  37. line 3
  38. line 2
  39. True
  40. line 2

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