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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 948 · 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: a result on screen is an output. (a) False (b) True
  2. 2.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 590; // 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 3 (c) line 2 (d) line 4
  3. 3.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  4. 4.Which of these is processing? (a) tapping a button (b) taking a photo (c) a pop-up message (d) checking a password
  5. 5.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) tapping a button (d) working out a tip
  6. 6.Which of these is an output? (a) sorting the scores (b) a beep sound (c) tapping a button (d) typing your age
  7. 7.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 3 (c) line 1 (d) line 4
  8. 8.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
  9. 9.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
  10. 10.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) output (b) input (c) processing
  11. 11.🔍 Which is the odd one out? (a) a pop-up message (b) a beep sound (c) speaking a command (d) a result on screen
  12. 12.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  13. 13.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
  14. 14.🔍 Which is the odd one out? (a) adding up a bill (b) sorting the scores (c) checking a password (d) a beep sound
  15. 15.⚙️ What number does this app show?
    let price = 60; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  16. 16.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) processing (c) input
  17. 17.⚙️ In an app, is adding up a bill an input, processing or an output? (a) output (b) input (c) processing
  18. 18.🔍 Which is the odd one out? (a) a result on screen (b) tapping a button (c) a buzz (vibration) (d) a beep sound
  19. 19.⚙️ What number does this app show?
    let price = 85; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  20. 20.Which of these is an input? (a) typing your age (b) a result on screen (c) checking a password (d) working out a tip
  21. 21.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  22. 22.Which of these is an output? (a) tapping a button (b) adding up a bill (c) a buzz (vibration) (d) checking a password
  23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 35; // 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 3 (b) line 1 (c) line 2 (d) line 4
  24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 8; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 1 (b) line 3 (c) line 2
  25. 25.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) adding up a bill (d) taking a photo
  26. 26.Which of these is an output? (a) tapping a button (b) typing your age (c) taking a photo (d) a pop-up message
  27. 27.🔍 Which is the odd one out? (a) a beep sound (b) checking a password (c) a buzz (vibration) (d) a pop-up message
  28. 28.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
  29. 29.⚙️ What number does this app show?
    let price = 10; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
  30. 30.⚙️ 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 2 (b) line 3 (c) line 1
  31. 31.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
  32. 32.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
  33. 33.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 69; // typed by the user
    line 2: let friends = 3; // 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
  34. 34.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
  35. 35.⚙️ What number does this app show?
    let price = 140; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  36. 36.⚙️ In an app, is taking a photo an input, processing or an output? (a) processing (b) output (c) input
  37. 37.⚙️ What number does this app show?
    let price = 150; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  38. 38.Which of these is processing? (a) tapping a button (b) speaking a command (c) a pop-up message (d) sorting the scores
  39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 75; // typed by the user
    line 2: let friends = 3; // 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
  40. 40.⚙️ What number does this app show?
    let price = 550; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);

Answer key

  1. True
  2. line 3
  3. 225
  4. checking a password
  5. working out a tip
  6. a beep sound
  7. line 3
  8. 10000
  9. input
  10. output
  11. speaking a command
  12. 330
  13. 12000
  14. a beep sound
  15. 120
  16. input
  17. processing
  18. tapping a button
  19. 510
  20. typing your age
  21. 165
  22. a buzz (vibration)
  23. line 3
  24. line 2
  25. adding up a bill
  26. a pop-up message
  27. checking a password
  28. output
  29. 40
  30. line 2
  31. 260
  32. output
  33. line 3
  34. 8000
  35. 110
  36. input
  37. 120
  38. sorting the scores
  39. line 3
  40. 530

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