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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 394 · 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.True or false: working out a tip is processing. (a) False (b) True
  2. 2.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  3. 3.True or false: adding up a bill is an input. (a) True (b) False
  4. 4.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) processing (c) input
  5. 5.True or false: typing your age is an input. (a) True (b) False
  6. 6.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 120; // 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 4 (c) line 1 (d) line 3
  7. 7.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) processing (c) output
  8. 8.⚙️ What number does this app show?
    let km = 5; // typed by the user
    let metres = km * 1000;
    show(metres);
  9. 9.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) working out a tip (d) a beep sound
  10. 10.⚙️ What number does this app show?
    let price = 590; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  11. 11.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) input (c) processing
  12. 12.True or false: a result on screen is an input. (a) True (b) False
  13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 470; // 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
  14. 14.⚙️ In an app, is typing your age an input, processing or an output? (a) processing (b) input (c) output
  15. 15.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) processing (c) input
  16. 16.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
  17. 17.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
  18. 18.🔍 Which is the odd one out? (a) typing your age (b) a pop-up message (c) speaking a command (d) tapping a button
  19. 19.⚙️ What number does this app show?
    let price = 480; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
  20. 20.⚙️ What number does this app show?
    let bill = 190; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  21. 21.⚙️ 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);
  22. 22.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  23. 23.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
  24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total);     (a) line 2 (b) line 3 (c) line 1 (d) line 4
  25. 25.True or false: working out a tip is an output. (a) False (b) True
  26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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
  27. 27.🔍 Which is the odd one out? (a) a result on screen (b) checking a password (c) a buzz (vibration) (d) a beep sound
  28. 28.Which of these is an output? (a) working out a tip (b) checking a password (c) a pop-up message (d) typing your age
  29. 29.🔍 Which is the odd one out? (a) a beep sound (b) working out a tip (c) checking a password (d) sorting the scores
  30. 30.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 1 (c) line 2
  31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 6; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 2 (b) line 3 (c) line 1
  32. 32.🔍 Which is the odd one out? (a) a beep sound (b) a buzz (vibration) (c) a result on screen (d) adding up a bill
  33. 33.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
  34. 34.⚙️ What number does this app show?
    let price = 210; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  35. 35.⚙️ 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);
  36. 36.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 44; // 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 3 (b) line 1 (c) line 2 (d) line 4
  37. 37.⚙️ What number does this app show?
    let price = 15; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  38. 38.⚙️ What number does this app show?
    let price = 440; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  39. 39.🔍 Which is the odd one out? (a) working out a tip (b) sorting the scores (c) checking a password (d) taking a photo
  40. 40.Which of these is an output? (a) sorting the scores (b) tapping a button (c) typing your age (d) a result on screen

Answer key

  1. True
  2. 30
  3. False
  4. output
  5. True
  6. line 3
  7. output
  8. 5000
  9. working out a tip
  10. 580
  11. processing
  12. False
  13. line 3
  14. input
  15. processing
  16. 8000
  17. processing
  18. a pop-up message
  19. 470
  20. 38
  21. 400
  22. 300
  23. output
  24. line 3
  25. False
  26. line 3
  27. checking a password
  28. a pop-up message
  29. a beep sound
  30. line 2
  31. line 2
  32. adding up a bill
  33. 9000
  34. 180
  35. 150
  36. line 3
  37. 30
  38. 410
  39. taking a photo
  40. a result on screen

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