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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 337 · 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.⚙️ What number does this app show?
    let bill = 54; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
  2. 2.⚙️ What number does this app show?
    let price = 70; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  3. 3.⚙️ In an app, is working out a tip an input, processing or an output? (a) input (b) processing (c) output
  4. 4.🔍 Which is the odd one out? (a) a pop-up message (b) adding up a bill (c) a buzz (vibration) (d) a beep sound
  5. 5.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 70; // 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 3 (d) line 1
  6. 6.🔍 Which is the odd one out? (a) a pop-up message (b) a result on screen (c) working out a tip (d) a beep sound
  7. 7.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) processing (c) input
  8. 8.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 1 (b) line 3 (c) line 2 (d) line 4
  9. 9.Which of these is processing? (a) taking a photo (b) a pop-up message (c) adding up a bill (d) tapping a button
  10. 10.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  11. 11.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
  12. 12.⚙️ What number does this app show?
    let bill = 44; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  13. 13.🔍 Which is the odd one out? (a) taking a photo (b) typing your age (c) a pop-up message (d) speaking a command
  14. 14.True or false: a beep sound is an input. (a) False (b) True
  15. 15.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 600; // 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 1 (c) line 3 (d) line 2
  16. 16.True or false: typing your age is an input. (a) True (b) False
  17. 17.⚙️ In an app, is speaking a command an input, processing or an output? (a) input (b) output (c) processing
  18. 18.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) adding up a bill (d) a beep sound
  19. 19.⚙️ In an app, is a result on screen an input, processing or an output? (a) output (b) processing (c) input
  20. 20.⚙️ 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 2 (b) line 1 (c) line 3
  21. 21.🔍 Which is the odd one out? (a) typing your age (b) checking a password (c) adding up a bill (d) working out a tip
  22. 22.⚙️ What number does this app show?
    let price = 190; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 60; // 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 4 (b) line 3 (c) line 2 (d) line 1
  24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 440; // 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 2 (b) line 1 (c) line 4 (d) line 3
  25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 10; // 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 2 (d) line 1
  26. 26.⚙️ What number does this app show?
    let price = 450; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  27. 27.True or false: sorting the scores is processing. (a) True (b) False
  28. 28.Which of these is an input? (a) taking a photo (b) a pop-up message (c) a buzz (vibration) (d) checking a password
  29. 29.🔍 Which is the odd one out? (a) sorting the scores (b) tapping a button (c) working out a tip (d) adding up a bill
  30. 30.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) typing your age (d) a buzz (vibration)
  31. 31.True or false: a buzz (vibration) is an input. (a) False (b) True
  32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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
  33. 33.Which of these is processing? (a) a beep sound (b) sorting the scores (c) typing your age (d) a pop-up message
  34. 34.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  35. 35.🔍 Which is the odd one out? (a) a pop-up message (b) taking a photo (c) a result on screen (d) a beep sound
  36. 36.True or false: speaking a command is an output. (a) False (b) True
  37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 36; // 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 3 (d) line 4
  38. 38.⚙️ What number does this app show?
    let km = 9; // typed by the user
    let metres = km * 1000;
    show(metres);
  39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 380; // 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 1 (c) line 3 (d) line 2
  40. 40.Which of these is an input? (a) a buzz (vibration) (b) checking a password (c) sorting the scores (d) speaking a command

Answer key

  1. 18
  2. 210
  3. processing
  4. adding up a bill
  5. line 3
  6. working out a tip
  7. input
  8. line 3
  9. adding up a bill
  10. 270
  11. input
  12. 22
  13. a pop-up message
  14. False
  15. line 3
  16. True
  17. input
  18. a beep sound
  19. output
  20. line 2
  21. typing your age
  22. 160
  23. line 3
  24. line 3
  25. line 3
  26. 420
  27. True
  28. taking a photo
  29. tapping a button
  30. a buzz (vibration)
  31. False
  32. line 3
  33. sorting the scores
  34. 50
  35. taking a photo
  36. False
  37. line 3
  38. 9000
  39. line 3
  40. speaking a command

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