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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 659 · 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 price = 25; // 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
  2. 2.⚙️ What number does this app show?
    let price = 260; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  3. 3.⚙️ 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 3 (b) line 1 (c) line 2
  4. 4.True or false: a pop-up message is an output. (a) False (b) True
  5. 5.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // 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 2 (b) line 4 (c) line 3 (d) line 1
  6. 6.⚙️ What number does this app show?
    let bill = 185; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  7. 7.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 32; // 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 4 (d) line 3
  8. 8.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) output (c) processing
  9. 9.True or false: typing your age is processing. (a) True (b) False
  10. 10.True or false: adding up a bill is an input. (a) True (b) False
  11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 2 (c) line 4 (d) line 3
  12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 120; // 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 2 (b) line 3 (c) line 1 (d) line 4
  13. 13.True or false: taking a photo is an output. (a) True (b) False
  14. 14.⚙️ What number does this app show?
    let bill = 40; // typed by the user
    let friends = 4; // typed by the user
    let share = bill / friends;
    show(share);
  15. 15.Which of these is an output? (a) a beep sound (b) speaking a command (c) taking a photo (d) tapping a button
  16. 16.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) output (c) processing
  17. 17.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 30; // typed by the user
    let pay = price - off;
    show(pay);
  18. 18.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 100; // 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 2 (d) line 3
  19. 19.⚙️ What number does this app show?
    let bill = 102; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  20. 20.True or false: a result on screen is an input. (a) False (b) True
  21. 21.🔍 Which is the odd one out? (a) a beep sound (b) working out a tip (c) a result on screen (d) a pop-up message
  22. 22.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  23. 23.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // 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 2 (c) line 3 (d) line 1
  24. 24.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) processing (c) output
  25. 25.⚙️ In an app, is adding up a bill an input, processing or an output? (a) processing (b) output (c) input
  26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 14; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 1 (c) line 2
  27. 27.⚙️ What number does this app show?
    let price = 55; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
  28. 28.Which of these is an input? (a) a pop-up message (b) a result on screen (c) tapping a button (d) adding up a bill
  29. 29.⚙️ What number does this app show?
    let bill = 159; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
  30. 30.⚙️ What number does this app show?
    let bill = 146; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  31. 31.🔍 Which is the odd one out? (a) speaking a command (b) checking a password (c) adding up a bill (d) sorting the scores
  32. 32.🔍 Which is the odd one out? (a) taking a photo (b) working out a tip (c) adding up a bill (d) sorting the scores
  33. 33.True or false: a beep sound is an input. (a) True (b) False
  34. 34.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
  35. 35.⚙️ What number does this app show?
    let bill = 65; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
  36. 36.True or false: a beep sound is an output. (a) False (b) True
  37. 37.⚙️ What number does this app show?
    let price = 320; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  38. 38.Which of these is processing? (a) working out a tip (b) a beep sound (c) speaking a command (d) typing your age
  39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 410; // 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 3 (b) line 2 (c) line 4 (d) line 1
  40. 40.True or false: a beep sound is processing. (a) True (b) False

Answer key

  1. line 3
  2. 230
  3. line 2
  4. True
  5. line 3
  6. 37
  7. line 3
  8. processing
  9. False
  10. False
  11. line 3
  12. line 3
  13. False
  14. 10
  15. a beep sound
  16. input
  17. 490
  18. line 3
  19. 51
  20. False
  21. working out a tip
  22. 60
  23. line 3
  24. input
  25. processing
  26. line 2
  27. 220
  28. tapping a button
  29. 53
  30. 73
  31. speaking a command
  32. taking a photo
  33. False
  34. output
  35. 13
  36. True
  37. 300
  38. working out a tip
  39. line 3
  40. False

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