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App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 328 · 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 km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
  2. 2.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) output (c) input
  3. 3.🔍 Which is the odd one out? (a) a pop-up message (b) working out a tip (c) a beep sound (d) a buzz (vibration)
  4. 4.⚙️ In an app, is adding up a bill an input, processing or an output? (a) input (b) processing (c) output
  5. 5.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 40; // 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 4 (b) line 2 (c) line 3 (d) line 1
  6. 6.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) output (c) processing
  7. 7.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // 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 2 (c) line 1 (d) line 4
  8. 8.⚙️ In an app, is tapping a button an input, processing or an output? (a) input (b) processing (c) output
  9. 9.⚙️ In an app, is typing your age an input, processing or an output? (a) output (b) input (c) processing
  10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 164; // 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 3 (c) line 1 (d) line 2
  11. 11.🔍 Which is the odd one out? (a) checking a password (b) sorting the scores (c) a buzz (vibration) (d) working out a tip
  12. 12.Which of these is processing? (a) a result on screen (b) typing your age (c) taking a photo (d) sorting the scores
  13. 13.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
  14. 14.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  15. 15.⚙️ What number does this app show?
    let bill = 64; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  16. 16.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
  17. 17.🔍 Which is the odd one out? (a) sorting the scores (b) a pop-up message (c) a buzz (vibration) (d) a beep sound
  18. 18.⚙️ What number does this app show?
    let price = 100; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  19. 19.🔍 Which is the odd one out? (a) a result on screen (b) a pop-up message (c) adding up a bill (d) a buzz (vibration)
  20. 20.⚙️ In an app, is sorting the scores an input, processing or an output? (a) output (b) input (c) processing
  21. 21.⚙️ 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 3 (b) line 1 (c) line 2
  22. 22.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  23. 23.Which of these is an output? (a) adding up a bill (b) a result on screen (c) working out a tip (d) tapping a button
  24. 24.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a result on screen (d) tapping a button
  25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 130; // 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 4 (d) line 2
  26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 1 (b) line 2 (c) line 3
  27. 27.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
  28. 28.⚙️ 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 1 (d) line 2
  29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres);     (a) line 3 (b) line 2 (c) line 1
  30. 30.⚙️ 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);
  31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 117; // 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 3 (b) line 4 (c) line 2 (d) line 1
  32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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 2 (b) line 4 (c) line 1 (d) line 3
  33. 33.🔍 Which is the odd one out? (a) adding up a bill (b) checking a password (c) speaking a command (d) sorting the scores
  34. 34.⚙️ 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 4 (b) line 2 (c) line 3 (d) line 1
  35. 35.⚙️ What number does this app show?
    let price = 240; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  36. 36.Which of these is an input? (a) sorting the scores (b) checking a password (c) a buzz (vibration) (d) taking a photo
  37. 37.⚙️ In an app, is a result on screen an input, processing or an output? (a) input (b) processing (c) output
  38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 65; // 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
  39. 39.⚙️ What number does this app show?
    let bill = 38; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  40. 40.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);

Answer key

  1. 8000
  2. output
  3. working out a tip
  4. processing
  5. line 3
  6. output
  7. line 3
  8. input
  9. input
  10. line 3
  11. a buzz (vibration)
  12. sorting the scores
  13. 7000
  14. 60
  15. 32
  16. 80
  17. sorting the scores
  18. 600
  19. adding up a bill
  20. processing
  21. line 2
  22. 150
  23. a result on screen
  24. tapping a button
  25. line 3
  26. line 2
  27. output
  28. line 3
  29. line 2
  30. 30
  31. line 3
  32. line 3
  33. speaking a command
  34. line 3
  35. 220
  36. taking a photo
  37. output
  38. line 3
  39. 19
  40. 2000

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